It says on the Digital Leisure website that the game features "absolutely no multi-solution puzzles" so that answers that one....which is a good sign. It's Sudoku -- It's fun and simple and for $5 why not.

Honestly - I think this review is a little bit biased for a 500 point game with balance board support... here is what another reviewer thought:

http://www.frictionlessinsight.com/archives/2008/10/the-incredible-2.html

Downloaded it this morning -- The game is actually fun and kinda challenging...I'm pleasantly surprised! Honestly...for 500 points just give it a download before slamming it.