PuzzleScript is a simple, open-source game engine by Stephen “increpare” Lavelle that allows you to easily create turn-based puzzle games using a unique scripting language. The engine is HTML5-based and games can be built and shared (along with their source code) straight from your browser. The graphics, which are composed of 5×5 tiles, are also designed within the editor, in the same manner that levels are defined.
There are already quite a few clever games in the burgeoning PuzzleScript gallery, showing off the flexibility of the engine, as well as its ease-of-use – although some of the developers are seasoned indies (like Terry Cavanagh, Joseph White, and Stephen himself), quite a few of them are from first-time creators (like Jonah Ostroff, who made Heroes of Sokoban, shown above).