Pros A lot cleaner than erasing and writing on paper
Cons It constantly freezes with message One Moment Please, very annoying in a timed game. Also, it prevents you from entering a mistake, so you can guess.
Summary It would be a perfect game if it weren't for the constant "One Monent Please" blue screens that interrupt your gameplay and thought process while the timer continues to count. Entering numbers and moving around with the keys is a little time consuming, but not as frustrating as entering text on the PSP. Great way to practice and improve your skills. Very addictive.