This a compilation of the levels from the 2008 Vanilla Level Design Contest (VLDC.) It contains 50 levels which you can play in any order you wish - all of them are open from the start.
Note that even when the game autosaves, it doesn't keep track of which levels have been cleared or which levels you collected the Yoshi coins, so you will have to do that yourself. The level credits file marks how many exits are in each level and which ones contain Yoshi Coins.
some levels are still good like Mario ware and the second place level but others are horrible like the ice castle with the puzzle that barely works and the first place level has a bit of a mad palette and the last place one is just a bit awkward I guess but overall good hack.