I noticed that someone on the high scores page of Mahjong Connect typed in their comment, "There's a glitch on Level Two." So I went to another site and played the game there to see what was different ... and, YES, there's a glitch on Level Two. Cubes disappear, and according to how the game played on the alternate site I visited, that's not supposed to happen.
Also, didn't there used to be a game called "Hexagon" or something like that? You played against the computer to see who could fill in the most segments within the game board, which was a hexagon.