GameSpot Review
- Rated 8.4 by Jeff Gerstmann. "If you didn't play Parappa to death and love every minute of it, you might as well skip out on Um Jammer Lammy." Reader reviews.
- http://www.gamespot.com/ps/puzzle/umjammerlammy/

GameCritics.com
- Review, rated 7.5 by Dale Weir, 8.5 by Chi Kong Lui. "UJL is not nearly as polished and endearing as PaRappa's, but Lammy's quest is certainly silly and innocent enough to be a refreshing break from the norm."
- http://www.gamecritics.com/review/umjamlammy/main.php

Hardcode Gaming reader review
- [6/10] Reviewed by Decimus. "If you played Parappa, this game comes highly recommended. It's also worth a try if you're in the mood for something completely different than the usual gaming trite."
- http://www.hardcoregaming.com/hgreviews/lammyrdr.htm

All-Reviews.com - Um Jammer Lammy
- [2/4] Review by Tom Allen. "Die-hard music fans may like it, especially for the two-player co-op and two-player competitive modes, but I'm going to pass."
- http://www.all-reviews.com/videogames/umjammer-lammy.htm

Absolute Playstation International review
- [85/100] Reviewed by Tom. "Parappa rapped, but Lammy jams! Check out yet another very cool musical action game that will have your feet tapping and your fingers working overtime to keep the beat!"
- http://www.absolute-playstation.com/api_review/rumjammer.htm