Minecraft wiki entry for Markus_Persson, associated text: Wurm Online, an MMO featuring sandbox elements similar to Minecraft.
MEG4kMAN, a Mega Man clone featuring old-school graphics.
Left 4k Dead, a zombie shooter game inspired by Left 4 Dead. (Archived here)
t4kns, a real time strategy game. (Archived here)
Miners4k, a game kind of inspired by Lemmings and Diggers. (Archived here)
Hunters4k, a first person shooter.
Dungeon4k, a dungeon exploration game. (Archived here and here)
Sonic Racer 4k, a racing game with stolen sprites. (Archived here)
Dachon4k, a gravity based shooter. (Archived here)
l4krits, a Luxor clone. (Archived here)
Blast Passage, an 8-Bit mashup between Bomberman and Gauntlet. (Archived here)
Bunny Press, a violent puzzle game made for Ludum Dare 14. (Archived here)
Breaking the Tower, a slow-paced strategy game. (Archived here)
The Europa Arcology Incident, an RPG-style game Notch made in 48 hours for Ludum Dare 16.
Infinite Mario Bros, a Super Mario clone featuring an endlessly-long level. (Archived here)
Metagun, a puzzle game Notch made in 48 hours for Ludum Dare 18.
Minecraft 4k, Minecraft in less than 4 KB for a Java4K competition.
Minicraft, a top-down Zelda-esque game with elements from Minecraft, made for Ludum Dare 22.
Shambles, a hectic shooter greatly inspired by Doom.
Cliffhorse, an open-ended game in which you play as a horse that can scale cliffs.
Last Minute Christmas Chopping, in which you play as Santa collecting wood to build a sleigh.
Drop, a typing game that increases in speed as you play.
Drowning in Problems, a clicker game that gets progressively more complicated.