A red ball must travel from START at the bottom corner to FINISH at the top corner. Every small cube contains a pipe — either straight or elbow. You decide which.

The route must pass through every cube — no leftovers, no shortcuts. The "In path" counter shows your progress.

Tap a pipe to select its cube. Then rotate it around X/Y/Z or ⇄ swap its shape to weave the path forward. To reach an inner cube, click the same spot again to cycle through cubes along the ray, or drag the Explode slider to pull the lattice apart.

Drag to orbit · Pinch / scroll to zoom · Solve ▶ auto-completes the puzzle.