SRB2 1.09.4 Hidden Red Volcano Secret / Extra Level - Sonic Robo Blast 2 (v1.09.4)

Описание: "An early demo of Red Volcano Zone Act 1 is hidden in the file soar.dta but encrypted so that it crashes the game when loaded normally. To access it, follow these steps: First, complete the unmodified game three times. The game is considered completed upon beating Castle Eggman Zone Act 3, even if it was accessed via a save file or level select. Then, in Greenflower Zone Act 1, go to the plateau that contains the red brick house with Sonic's emblem on it. Jump on the house of the roof three times and RedXVI will appear in front of the door, asking: "Hey! Who's making all that racket?" If you touch him, he will call you out on disturbing his sleep and say "What's the big idea? Do you just go around jumping on people's houses for fun, disturbing their sleep? Go to hell!". After a few seconds, you will die and respawn in RVZ1. After completing it, you will be sent back to GFZ1 and may continue normally.

Note that while RVZ1 is accessible in netgames by the same method, the game will crash if a player joins while the map is RVZ1. To avoid this, adjust the player limit so nobody can join."

Source - SRB2 wiki and SRB2 historic downloads section.