Disgaea: Afternoon of Darkness for PSP Reviews by Gamers

Unlike the recent port of psp game from the original PS1 FF: Tactics, this game is absolutely flawless! No hiccups, no slowdowns. It is smooth and very very fast. Awesome original story with humor and battle system with incredible depth. If you have not played this game for PS2 this PSP port is definitely worth checking out! It even includes multiplayer mode which was not available in the original ps2 game. Stunning visuals with infinite replay value, if you are a fan of strategy RPG don't pass this up!

I travel often, and this has been my one and only PSP title for a year now. I only get to play 1-4 hours at a time, and as such, this title is perfect for those type of sessions. If you like grinding, being a perfectionist, solving puzzles ( figuring out the perfect color grid combination to wreck the entire map in one move ), and being challenged, this is the game for you. I could put more detail but others have already said enough.
The only thing I could add is that you need patience for the game at first, because it is unrelenting. Once you learn how to "exploit" the advantages of the movement/action system, and how to correctly predict enemy actions, its simply an amazing game.