5-Minute Mystery might not be quite as good as 5-Minute Dungeon, but it is a truly original combination of speed and deduction mechanics leading to a highly enjoyable game that the whole family should enjoy.
Bellz! has some interesting ideas and is quite easy to play, but unfortunately relies on too much luck leading to a game that becomes repetitive pretty quickly.
5-Minute Dungeon Curses! Foiled Again! takes the already excellent gameplay of the original and adds in some intriguing twists to make the game more challenging.
5-Minute Dungeon might not be your typical dungeon crawler, but it is the best speed game that I have ever played.