It takes ideas from puzzle games like Sokoban and Boulder Dash, but the inclusion of active objects gives it a real-time component, and it can also produce arcade-game levels like those found in Pac-Man.
[1] As time passed, roughly 500 additional levels from various developers and designers would be added to the registered package; they could also be opened in the unregistered version.
Version 1 of Kye was released in January 1992, and was widely distributed in the UK in collections of shareware games.
This version contained all the main features of the game, including mouse control, real-time movement of objects, and the active monsters.
Version 2 introduced a visual level editor and new objects which increased the scope of the game, including black holes, shooters and timer blocks.
[6] Compared to the original Windows 3.x version this remake includes music and improved movement, thanks to better handling of repeat inputs using joystick control.
(Although Kye lacks a fillable-hole object, it is possible to combine the sticky blocks with some traps to enable a Sokoban-like gameplay.)
These have some similarity with falling-rocks puzzle games, but since in Kye they can go in four directions, and there are also turning blocks (clockers and anticlockers) that can redirect a stream of sliders or rockies, it is possible to construct circular flows and periodic mechanisms.
Version 2 added timer blocks (making it easy to add time-delay mechanisms to levels), black holes (which destroy objects that flow, wander or are pushed into them), and shooters (which create new sliders or rockies).