Crimson Gem Saga (from now on will be referred to as CGS) features a turn based battle system not unlike the classic Final Fantasy games but with it's own modifications. Battle consists of 4 party members arranged in: Front, middle, middle, rear. The front member can deal the most physical damage but also take the most. Rear deals the least physical damage but also takes the least. Middle members are balanced. Characters can use standardized attacks or Skills to deal damage to their foes. Skills require MP with each skill using a designated amount of MP. Skills can be either physical (some having status effects) or elemental/magic. Also, skills can be used in Combination with other members; one attack will be performed by 2 members and consumes MP (i.e. 30MP) from both characters. This is also a major flaw near the beginning of the game. Players will start off with low amounts of MP and may need to use a skill. This means all MP may be consumed from a single attack and healing items to not restore much MP, even later on. Overall, the battle system is impressive and reminiscent of classic 8 and 16 bit RPGs of old. Since enemies are on screen you can be ambushed at any moment, providing an added level of strategy to the game.
The story of CGS itself is also intriguing, featuring a talented voice cast that rivals even the best of high budget console games. The story follows Killian von Rochoff. The story begins with Killian trying to recover from the previous night's party and then trying to get to his graduation on time. But poor Killian; nothing ever seems to go his way. Killian is living proof that Murphy's Law is real.
Visually, CGS is superb using 2D Isometrics with high resolution sprites and smooth environments. Visual aspects are near flawless. The only downside is that enemies can ambush you from behind corners or trees, etc that can't be seen through. This is a major downside if you're low on items. However, you can save at almost any moment so no need to worry.
I definitely recommend Crimson Gem Saga to anyone with a PSP and is fan of RPGs (which you are because you are reading this).