Which gaming mascot was originally created as a placeholder graphic during development but became so popular that the company adopted it as their official brand identity?

Brand mascots have become synonymous with many successful gaming companies, creating instant recognition and fostering player loyalty. These iconic characters often transcend their original games to become cultural symbols and marketing powerhouses. Test your knowledge about these virtual ambassadors that have shaped gaming history and brand identity in the interactive entertainment industry.

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Mario (Nintendo)
Kirby (HAL Laboratory/Nintendo)
Sonic the Hedgehog (SEGA)
Master Chief (Xbox/Microsoft)