2026-07-20 · history
PuzzleScript (2013) — The One-Line Rule That Mass-Produced the World's “Pushing Games”
In October 2013, indie developer Stephen Lavelle (increpare) released PuzzleScript, a free browser-based puzzle engine whose Sokoban-style push rule fits on a single line of code. Traced forward, it runs through Alan Hazelden's early jam games into A Good Snowman Is Hard to Build, and — by Hempuli's own account — into the block-pushing puzzle revival that fed Baba Is You. Here the lineage is checked against the record.