Klax is an arcade game released in 1990 by Atari. A GBC port was later released in 2000, & was developed by Digital Eclipse.

According to a few people, if you were to pop in the GBC port into any Gameboy predating it, you'll get an error screen that's a shot of the Digital Eclipse logo with a sad face. No actual evidence of this screen exists online as of now, & the only way to find out is if someone were to actually get a copy of the game, & put it in any Gameboy that predates the GBC.

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