Doom on GBA wasn't as great as I expected. For sure it's a wonder, Doom is on a handheld now! The graphic is great for GBA although it's a bit blocky. I know that Doom has ever been blocky, but on GBA is even more. It's fast enough but I found the controls a bit hard.
There is almost everything from the original Doom (some monster couldn't be fit in the GBA). All the original difficulty levels and the 3 episodes + a multiplayer option.
I don't if it's the game or is just this version, but now Doom doesn't look as funny as the original one. Too bad...