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Q*bert's Qubes, while not a "grail", is a rare game, and many games are rare for a reason. However, Qubes has excellent gameplay and the Colecovision version is well worth tracking down.
ColecoVisionDigital Press - Classic Video Games
Make no mistake about it, Q*bert's Qubes gets a thumbs up. But it terms of Q*bert sequels, my favorite is Q*Bert 3 for the SNES. That game sticks a little closer to the original Q*bert, but offers wild graphics and dozens of challenging pyramids to clear.
Atari 2600The Video Game Critic
Q*bert's Qubes has a substantial learning curve, but the game isn't half bad once you get the hang of it. The graphics however are disappointing. Instead of being solid in color, the sides of the cubes are rendered in pixelated patterns that are hard on the eyes. As with the first game, Q*bert is still missing his eyeballs, but at least your adversaries now hop smoothly from block to block. The bulk of the sound effects seem recycled from the first game. Q*bert's Qubes is more cerebral than your typical arcade game, and it won't appeal to most casual gamers for that very reason.