Some of the current top levels(anonymous guests can play):
Flip Flop - http://chesslike.net/lvl/151
Queen Bloodbath - http://chesslike.net/lvl/129
Tool1 - http://chesslike.net/lvl/130
King vs. Wives - http://chesslike.net/lvl/250 (I imagine this one will be removed once we implement the author needing to beat their own level for it to be published. Maybe we'll keep a few around. They're quite funny.)