• Goal
• Remove every red, yellow, and blue block from the board through the orange edge portals. Gray obstacle blocks stay where they are.

Movement rule

• Blocks slide with momentum: they keep going in the swiped direction until they hit a wall, an obstacle, or another block. To exit, line a block up with a portal and slide toward it.

Desktop controls

• Mouse swipe: click and drag a block in a cardinal direction (up / down / left / right), then release. The block slides until it hits something.
• Drag-to-exit: drag a block past the board edge through an aligned portal to remove it.
• Undo / Hint / Restart / Pause: bottom and top HUD buttons.

Mobile / touch controls

• Swipe: touch a block, swipe in a cardinal direction, release. Same momentum rule applies.
• Drag-to-exit: hold a block and drag it past the edge through a portal to remove.
• Tap: HUD buttons (undo, hint, restart, pause) all tap-friendly.