SONIC IKU DEMO is likely a demonstration build of a fan-made Sonic the Hedgehog game for the Sega Genesis. 'IKU' might refer to a specific aspect of the game's design or perhaps a Japanese word relating to the theme.  As a demo, the game would showcase a limited selection of features and content. The inclusion of 'demo' indicates it is an incomplete version of a larger project, developed outside of Sega's official production. Its history is representative of the initial stages of game development.

SONIC IKU DEMO

Sonic Hardcore - Survival Edition