| Console: | Nintendo Game Boy Advance |
| TV Standard: | NTSC |
| Country: | United States of America |
| Developer(s): | 3d6 Games, Inc. |
| Publisher(s): | THQ |
| Release Date: | 2002-11-25 |
| Players: | 2 |
| Co-op: | No |
| ESRB: | T - Teen |
| Type: | Action |
Zeus, creator and ruler of the Guardians of the Gates, raises you from your grave! You must go fourth and defeat a new, unknown evil that has destroyed the Guardians and ravaged the universe. To do so, you must collect the keys and Essence of each land, transforming you into beasts with unnatural powers and special abilities. Conquer this evil and you will become the sole Guardian, the protector of the universe.
Game Player of Altered Beast: Guardian of the Realms on Nintendo Game Boy AdvanceGenerally, you can review the controls (keyboard) setting during each game in the screen before it starts. Use the arrow keys and “Z”, “X”, “A”, “S”, “Q”, “E” buttons to play, or customize yourself with your gamepad or keyboard.
| Keyboard | Controls |
| ← → ↑ ↓ | Directions for LEFT, RIGHT, UP, DOWN |
| Enter ↵ | START |
| Shift | SELECT |
| Z | A |
| X | B |
| A | X |
| S | Y |
| Q | L |
| E | R |
