Knightfall 2 is a very well polished and crafted mixture of Super Collapse that manages to deliver more adept pacing than its commercially successful DS cousin, Puzzle Quest. There´s nothing particularly interesting about the game but thats ok, because it taps a fetish that gaming aesthetes seem to have in droves: puzzle/RPG hybrids. Competing with the persistent Metroidvania fetish, this mania for all things compulsive combined with ranking mechanics you can improve at over time speaks to some fundamental hunter-gatherer instinct, and this time you don´t even have to pay for it.
The game puts you in the whole of a whipped Knight whose wife hassles him to go out and do stuff, something many of us can relate to. You can rotate the board, spend APs to clear groups of blocks, and in this manner get the guy to drop on monsters and items. Pretty simple, but the purchasing of enchanted weapons, leveling and Zelda II-like vibe of talking to various peasants gives this a feel of completion.
(The original is pretty good too, however the inability to clear sets smaller than three makes for a very different flow and you may prefer just to play the Endless Dungeon in this version.)