Video-to-video reasoning across commercial generation models. Each task tests whether a model understands that objects persist while occluded.
A rectangular box is seen from a top-down view. In the first frame the top lid is open and one red ball is visible inside the box. The lid closes, hiding the ball. Then the entire box rotates by 90 degrees. Finally the lid opens again. The same ball must still exist inside the box after the rotation, with the same identity, color, size, and count.
There are two simple parallel raised bridges. One bridge has a large rectangular hole in the middle, and the other bridge is solid with no hole. A navy wheeled car starts on the bridge with the hole and drives from left to right at a constant speed. As soon as the car reaches the unsupported hole, it should fall downward through the gap while keeping forward inertia. The car must not hover above the hole, magically speed up, teleport across, or drive over empty space.
A single yellow wheeled car starts on the left and drives to the right along a low flat straight solid track. On the right side there is a solid gray wall. The view is level and shows the left impact face of the wall, which is the side the car hits. The car should continue moving right until it reaches the wall. When the car collides with the wall, it must be blocked and come to a stop. The car must not pass through the wall, overlap through the wall, emerge on the far side of the wall, or tunnel through it. The car must keep its identity, color, size, wheels, and count throughout the sequence.
In the first frame, there are two green opaque carts with their front doors open. The left cart contains a clearly visible cyan ball. The right cart contains a clearly visible pink ball. Both cart doors then close, hiding the balls inside the opaque carts. While the balls are hidden, the two carts swap left and right positions. After the carts finish swapping, both doors open again. The cyan ball must still be inside the same cart that started on the left, now on the right. The pink ball must still be inside the same cart that started on the right, now on the left. The balls must not swap identities, swap colors, switch carts, merge, disappear, teleport independently, duplicate, or change size.
A single teal ball is visible at the center. Two foreground sliding doors move inward on a fully connected top rail frame with side posts, slider blocks, and hangers. The doors close tightly to hide the ball and then reopen. The ball must still be present.
A single purple ball starts on the front one of two identical neutral gray tracks. Each track has a left-side U-shaped downhill section like a pirate-ship slide. Immediately after the U-shaped section reaches its lowest point, the track becomes a straight horizontal rail. Both straight rails enter an opaque gray container from the left. Only the front occupied track has the purple ball; the back track is empty. The ball enters the opaque container on the occupied front track and becomes hidden inside. On the right wall of the container, only the empty back track has an open exit hole and a straight rail continuing outside. The occupied front track has no right-side hole; instead a visible rail stub and stopper are attached to the sealed wall. Every other part of the right wall is closed. The same purple ball must continue to exist inside the container on its original occupied blocked track. It must not disappear, teleport, duplicate, switch to the empty track, or emerge from the empty-track exit.
A gray drawer starts open, viewed from a high top-down angle, and a green ball is clearly visible inside the open drawer. The drawer slides closed into its outer case, hiding the ball. Then the entire closed drawer unit moves to the right. Finally the drawer opens again, revealing that the same green ball is still inside at the new position. The ball must move with the drawer and must not remain behind, disappear, or pass through the drawer walls.
A green elevator box is visibly attached to two fixed vertical guide rails by guide brackets. In the first frame the front door is open and a purple ball is visible inside the elevator box. The door closes, hiding the ball. Then the entire guided elevator box moves upward along the rails. At the end the door opens again, revealing that the same purple ball is still inside the box and has moved upward with it. The ball must not stay at the original height or fall through the elevator floor.
A small brown car drives from left to right on a gray road. Ahead of it is a guillotine-style gate with two side posts, a top beam, and a solid gate blade already closed down across the road. The car wheels rotate around their left-right axle as the car moves. The car reaches the left face of the closed gate and stops. The car must not pass through or overlap the solid gate blade.
Two colored balls move at the same time on two neutral gray tracks. In the first frame, the brown ball is clearly visible on the front-left high track, and the gold ball is clearly visible on the back-left low track. The two tracks are at different heights: the brown ball's track is higher, and the gold ball's track is lower. Both tracks enter an opaque gray crossing cover. Inside the cover, the paths cross in the horizontal view while the balls are hidden, but the tracks are vertically separated so the balls do not collide or pass through each other. Each ball should roll along and above its own track, not through the track. After the hidden crossing, the brown ball should emerge on the back-right high path, and the gold ball should emerge on the front-right low path. The tracks are neutral gray and do not reveal identity by color. The brown and gold balls must preserve their identities through the hidden crossing. They must not swap colors, swap identities, merge, disappear, teleport, duplicate, pass through the rails, or change size.
Continue this scene as a short video. A single black ball is above the covered center hole of a semi-transparent box. There is a cap covering the hole. The ball naturally falls straight downward, lands on the cap, and remains above the box top. Preserve the ball's identity, color, size, count, and continuous vertical trajectory. The ball must not pass through the cap and must not enter the box interior.
A gold ball rolls into a gray opaque box. At first the box is open enough to show where the ball is going. After the ball enters, the lid rotates closed around a hinge. Once the lid is closed, the ball is completely hidden but must still exist inside the box. The ball must not disappear, duplicate, pass through the box wall, or pass through the lid.
A black tall car drives from left to right toward a low horizontal beam gate frame. The beam height is lower than the black car roof height. The black car must continue until the front of its roof touches the low beam, then stop at contact. It must not stop early and must not pass through the solid beam.
Two flat marked envelopes are open in the first frame. Envelope A contains a brown ball, and envelope B contains a red cube. The envelopes close, cross over, and swap screen positions. When they open again, the brown ball must still be inside envelope A and the red cube must still be inside envelope B.
An open shallow tray clearly contains a purple ball and an orange cube. The tray slides from left to right on visible rails and passes behind a fixed foreground screen. While hidden, the same ball and cube must continue to move with the same tray. After emerging, both objects must still be inside the tray with preserved identity, color, and count.
Three colored balls are visible: red, blue, and navy. A single opaque curtain panel is connected continuously to a top rail by a top clamp, vertical hangers, and rail blocks with no visible gaps. The curtain starts parked on the left, slides to the center foreground to fully hide the balls, then slides back left. The same balls must reappear with the same colors and order.
A gold ball and a blue cube are visible. A single opaque panel moves vertically in the foreground between two side posts. There is no top frame. The inner guide strips are directly attached to the side posts. The panel lowers to fully hide the objects, then rises again. The same ball and cube must reappear unchanged.
A small lime ball rolls from left to right along a gray straight track. A wide opaque gray screen stands in the middle of the track. When the small ball goes behind the screen it becomes fully hidden, but it should continue moving and then reappear on the right side. The same small ball must preserve identity, color, size, count, and continuous motion.
A gray box starts with its top open, viewed from a high angle, and a magenta ball is clearly visible near the center of the box. An opaque gray lid slides over the top and hides the ball. After the lid is closed, the front panel of the box slowly folds downward like a hinged flap. When the front panel has folded down, the same centered magenta ball is visible inside the box. The ball must continue to exist inside the closed box and must not disappear, teleport, or pass through the box walls.
Two wheeled cars move from left to right on two parallel straight flat solid tracks. The near track, closer to the camera, carries a low pink car with visible wheels. The far track carries a tall teal car with visible wheels. The teal car is three times as tall as the pink car when measured from the track surface to the top of the car. Both cars enter a gray opaque container. The camera-facing side of the container has a high side window. The bottom edge of the window is higher than the top of the pink car, so the pink car should not be visible through the window. The top edge of the window is higher than the top of the teal car, so only the upper part of the tall teal car should be visible through the window. The two cars must keep their identities, colors, sizes, tracks, wheels, and count throughout the sequence. The view should show the container roof and the right-side tail / exit of the container.
A rectangular box is seen from a top-down view. The top lid is open in the first frame. Inside the box there is one internal partition creating two compartments. On one side of the partition there are a blue ball and a gold cube. On the other side there is a teal regular triangular pyramid. The lid closes, the whole box rotates 90 degrees, and then the lid opens again. All three objects must still exist, preserve identity, color, size, and count, and remain separated by the partition.
A gray pendulum bob hangs from a fixed rope and swings left and right. A vertical opaque screen stands in the middle. When the bob swings behind the screen, it becomes hidden, but it should continue moving along the same pendulum arc. The same gray bob should later emerge from the other side with the same rope length and continuous motion.
Three objects are visible on a tabletop: a purple ball, a red cube, and a navy pyramid. A large opaque page-like panel is attached to a visible vertical hinge spine on the left. The page swings closed in the foreground, fully hiding the objects, then swings open again. The same three objects must reappear unchanged.
Continue this scene as a short video. A small gold ball rolls downhill along a wooden ramp. A solid opaque wall stands across the track. The ball should roll into the wall, make visible contact with the wall face, bounce slightly, and remain in front of the wall. The ball must not pass through the wall, must not teleport to the other side, and must preserve its identity, color, size, count, and continuous trajectory.
A magenta ball starts at rest near the top of a sloped ramp. Gravity makes the ball accelerate down the ramp. The ramp smoothly connects to a straight double-rail track. A solid opaque screen stands across the track, but it has a real rectangular opening larger than the ball. The ball rolls through the opening without penetrating solid material and continues to the right with the same color, size, and identity.
A sloped ramp has a gated enclosure at the top. The enclosure has double doors at the front and an open right exit, so the ball can roll out to the right. The first frame shows the double doors open outward and an orange ball visible inside the enclosure on the sloped ramp. Immediately after the first frame, the ball starts rolling down the ramp with gravity-like acceleration. The doors close while the ball moves, then reopen at the end. The ball finishes inside a lower open-top catch box. The ball must not pass through any wall, door, ramp, floor, or catch box.
Three colored balls are visible on the table: green, red, and yellow. A wide opaque screen slides across the foreground on a long visible support rail, between the camera and the balls, so it occludes the balls without physically passing through them. After the screen moves away, the same three balls must still be present with the same colors, identities, sizes, and positions.
Continue this scene as a short video. A small navy ball rolls downhill along the wooden slope. It enters the blue tunnel in the middle of the slope, becomes hidden by the tunnel, and then the same navy ball gradually exits from the other side of the tunnel, continuing downhill. Preserve the ball's identity, color, size, count, and left-to-right downhill trajectory.
A green ball rolls clockwise along a gray circular ring track. A large opaque square block stands in the middle of the ring. When the ball reaches the far side of the ring, it becomes fully hidden behind the central block. The same ball should continue moving and later reappear on the right side of the ring. The ball must preserve identity, color, size, count, and continuous motion.
A brown ball starts on a gray roller-coaster-like U-shaped rail track on the left. The track has two metal rails and cross ties, and the ball rolls continuously along the rails without jumping. The bottom of the U-shaped track directly connects to the floor of a transparent glass box. The ball enters the transparent box through the open left side, rolls across the box floor, and collides with the transparent right wall. One side segment of the transparent box is opaque. The transparent right wall is visible but physically solid, so the ball must stop inside the box and must not pass through the wall.
Three objects are visible in a row: a blue ball, a gray cube, and a navy pyramid. A wide supported foreground screen slides across on an overhead rail, hides them without touching them, and moves away. The same three objects must reappear unchanged.
A low red wheeled car drives into a gray container with a high side window. The window lower edge is above the red car, so when the car reaches the window region, the red car should remain hidden. The red car must continue to exist and later exit the container.
A slightly large magenta ball is released from the highest point of the left half of a roller-coaster style U-shaped track. The U bottom connects smoothly to a long horizontal platform extending to the right. On the platform there are three vertical barriers. The first barrier has a circular hole near the bottom whose bottom aligns with the ball bottom, but the hole diameter is only half of the ball diameter, so the ball cannot pass and must be blocked there. The second barrier has a much larger circular hole with diameter twice the ball diameter. The third barrier is solid and has no hole. The ball motion must stay continuous and physically plausible.
Three objects are arranged in a row behind an opaque sliding mask: a cyan ball, a gold cube, and a pink triangular pyramid. The mask has one rectangular window that slides across the row, revealing the objects one by one. The reveal order must match the original object order; no object may disappear or change identity.
A stage contains three objects arranged from left to right: a teal ball, a navy cube, and a magenta triangular pyramid. A purple opaque curtain covers the stage and later opens again. The objects must remain in the same positions with the same shapes, colors, and count.
Three colored balls roll from left to right on three parallel gray tracks. The upper lane has a lime ball, the middle lane has a green ball, and the lower lane has a cyan ball. Each ball enters its own opaque gray tunnel, becomes hidden while inside, and then exits on the right side. The balls must preserve identity, color, size, count, lane order, and continuous motion. They must not swap lanes, merge, disappear, or reappear in the wrong tunnel.
Three supported drawers are open in the first frame. From left to right they contain ball, cube, and pyramid. The drawers slide fully into real empty cabinet cavities, the cabinet shifts slightly, and the drawers open again. Each object must remain in its original drawer.
A red ball, a brown cube, and a teal pyramid are visible on a tabletop. A single large opaque screen hangs from visible hangers on a fixed overhead rail. The screen starts parked on the left without touching the support posts, slides to the center foreground to fully hide all three objects, then slides back left. The same objects must reappear unchanged.
A cyan ball rests on a horizontal trapdoor platform. A visible latch pin holds the trapdoor closed at first, so the ball stays supported and does not fall. The latch pin retracts. Only after the latch is removed, the trapdoor rotates downward around its hinge. The ball then loses support and falls through the opening to the floor. The ball must not fall before the support is removed, hover in midair, or pass through the closed trapdoor.
A supported turntable carries a single cyan cube. A foreground screen hides part of the turntable while it rotates one full 360-degree turn. The same cyan cube must remain on the turntable throughout.
A gray ball rolls from left to right and a brown ball rolls from right to left on the same gray straight track. They collide near the center. After the collision the gray ball should bounce back to the left and the brown ball should bounce back to the right. The two balls must not pass through each other, merge, disappear, or swap identities.
Two colored balls move at the same time on two identical neutral gray parallel tracks. In the first frame, the cyan ball is clearly visible on the front track and the orange ball is clearly visible on the back track. Both tracks enter the same opaque gray two-lane tunnel with open left and right ends. The tracks are neutral gray and do not reveal identity by color. The cyan ball and orange ball enter the tunnel and are briefly hidden inside. When they exit the tunnel on the right side, the cyan ball must still be the cyan ball on the front track, and the orange ball must still be the orange ball on the back track. The two balls must not swap identities, swap colors, change tracks, merge, disappear, teleport, duplicate, or change size.
A cyan ball rolls from left to right along a gray U-shaped track. A wide opaque square pillar stands in the middle of the scene. When the ball goes behind the pillar, it becomes completely hidden. The same ball should continue moving behind the pillar and then reappear from the right side. The ball must preserve its identity, color, size, and physically continuous motion.
Three parallel lanes are shown. Each lane has one opaque left-half U-shaped tube that smoothly connects at the bottom to a rightward open double-rail straight track. The near, middle, and far track balls are navy, brown, and lime. Each ball starts just outside the top mouth of its U tube, enters the opaque U tube, continues to exist while hidden, and emerges onto the same rightward double-rail track. The balls must preserve color, identity, size, count, and lane assignment.
Front view. A teal ball, a lime cube, and a pink pyramid are placed in a row. A foreground opaque sliding screen uses the same supported rail style as the previous screen example. The screen has a vertical central slit that is visibly wide but still narrower than the width of any object. As the screen moves, the slit reveals each object partially while the opaque panels hide the rest. The objects must not disappear, change color, or change identity.