Assertion: hedgehog's appearance | /r/HasProperty | developed as replacement
Facets:
value: for their existing alex kidd mascot
type: OTHER
value: for sega's response to mario
type: PURPOSE
Source sentences:
text: Developed as a replacement for their existing Alex Kidd mascot, as well as Sega's response to Mario, his first appearance was in the arcade game Rad Mobile as a cameo, before making his official debut in Sonic the Hedgehog (1991).