Prompt code:
A retro gaming poster with pixel art of classic video game characters in an 8-bit style. The characters are Mario, Link, Pikachu, and Sonic the Hedgehog. They are in a dynamic layout, with Mario jumping over a green tube, Link swinging on a vine, Pikachu standing on a rock, and Sonic running on a track. The background is a bright blue sky with fluffy white clouds. The poster has a nostalgic and fun vibe.
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