Basalt Courier
Build basalt stairs to collect TWO cargo seals from the right tower at height 4 and deliver each to the left depot. Walk between adjacent stacks: climb at most one level, but dropping down is safe. Pull raises the stack under your feet. A full layer across all four lanes clears, lowering every stack. Every THIRD pull destabilizes its lane: walk away before pulling there again. Height above 4 collapses. Cargo is collected automatically at the right tower; Deliver works only at the left depot.
Controls & scope
Tap the board or named controls. Tab and Enter/Space operate buttons; R restarts. The game-specific failure conditions are described above; terminal results lock input until Restart.
This is an original compact mechanic study, not a copy or full reproduction of the reference game. Research and scope are documented in README.md.
Original code & procedural visuals · Private local collection