Summary: Though there ARE 1000's of puzzles available, and more for DL, the graphics are mediocre at best and as, for the sounds, I played it with those turned off. Most irritating was the "please wait" message that keeps popping up every minute or so, that toally wrecks your concentration in trying to solve the puzzles. Another gripe about the game is the fact that "customizable background" feature DOES NOT WORK at all. This feature is advertised on the box and on the website.
Summary: Jumping on the Sudoku bandwagon it was just a matter of time before a conversion appeared on the PSP. But a poor effort it is. Given the game's simplistic nature it's really amazing that there are in fact bugs in the game. I found 2 within only one hour of play. Must frustrating is sometimes not being about to take back you moves! That's just lazy development, no other excuse. Save your cash, buy a newspaper.