The sound effects and music in I Wanna Be The Guy (IWBTG) are almost entirely sampled from classic 8-bit and 16-bit video games to create its parody atmosphere. Core Sound Effect Origins

Here’s a solid blog post draft about I Wanna Be The Guy sound effects—why they matter, how they work, and why they’re unforgettable.

: When "The Kid" explodes into blood, the game over music that plays is "Might Is Right But Tight" from the fighting game Guilty Gear Isuka Kraidgief" Boss : A hybrid of Zangief ( Street Fighter ) and Kraid ( ), this boss uses sound effects specifically from Kraid in Super Metroid Item Fanfares

The sound effects and music in I Wanna Be the Guy (IWBTG) are almost entirely sampled from classic video games, serving as a "sardonic love letter" to the 8-bit and 16-bit eras. Iconic Sound Effects & Origins Death Sound