Board Thread:Wiki Discussion/@comment-26843781-20160301110343/@comment-26242189-20160426222455

CrusaderDeleters wrote: Stevethebarbarian wrote: Unless there is some rediculous time-travel shennanigans going on, there is no way that Sans is Gaster, given that Gaster can be encountered legitimately now. You don't encounter Gaster in the game. The two figures you can encouter are Mystery Man, and the Eboa Figure. And I'm not sure if you can even encounter Eboa legitimately.

You CAN in fact, find the door in Waterfall, and find Gaster, WITHOUT EDITING THE FUN VALUES. Though it is very rare.