Marble Conduit
A pipe that connects is not enough: thread the marble through three runes in order. Rotate fixed elbows and straights, read both ports, and launch only when the whole route is safe.
IN enters left of bottom-left · OUT leaves right of top-right · cyan = last trace
How to play & accessibility
Select a pipe then rotate clockwise. Pipes cannot move. The marble enters tile13 from the left and must leave tile4 to the right after rune1(tile10), rune2(tile11), rune3(tile8). A pipe must accept the incoming side and carry to its other port; straight and elbow glyphs show connections. One pressure probe traces up to four visited tiles, including a blocking tile, and costs one action. Launch checks the entire route; leaks, loops and wrong rune order lose. Undo restores launch, rotation or probe.27 actions allow24 turns, a probe and launch with one spare.
Core gameplay runs locally. Published playtests include approved Google Analytics (G-FG52JBJRPS), which makes network requests.