Also known as: 簡易融合
A Yu-Gi-Oh! spell card that summons a level 5 or lower fusion monster. It looks like a green Instant Cup Noodles with the word "Fusion" written on it. There's a running gag where monsters on the Forbidden List that abuse this card for their Special Summons are slurping the ramen.
In March 2026, a limited time Nissin Cup Noodle version of Instant Fusion was released, with the outside rendered like the spell card, while the inside is just a regular Cup Noodle.