| Name | Reviewer | Quote | Score |
| The-Laser.com (GameCube) | Michael Palisano | The game is solidly constructed, surprisingly challenging and lots of fun. | B+ |
| Gaming-Age.com (GameCube) | Brian Peterson | One thing that does help Billy Hatcher out from complete mediocrity is the multiplayer mode. | C+ |
| GamingWorldX.com (GameCube) | John Luedtke | The experience of Billy Hatcher can be summed up in one word: underachieving. | 6.0 out of 10 |
| GameSpy.com (GameCube) | Benjamin Turner | In an eggshell, Billy Hatcher and the Giant Egg is worth checking out for platform and Sonic Team fans, but is likely too difficult and glitchy for more casual players. | 3 out of 5 Stars |
| GameSpot.com (GameCube) | Ryan Davis | Save for the peculiar mechanics of the giant eggs, it falls back on standard 3D platforming mechanics more often than not. | 6.7 out of 10 |
| GameZone.com (GameCube) | Louis Bedigan | Billy Hatcher is an addictive platformer for anyone who loves Super Monkey Ball. | 7.8 out of 10 |
| FireSquad.Gamers.com (GameCube) | Marcus Yam | Although there are parallels to Mario Sunshine, Billy Hatcher and the Giant Egg is a highly original game. | 70% |
| ArmChairEmpire.com (GameCube) | Omni | Billy Hatcher may never catch on as a marquee Sega character, but his debut is a somewhat fun game on the cartoony side of weird. | 7.9 out of 10 |