Diogenesthecynic/FullScreenMario — pull request #103 by blamonet (2013-11-12 02:31:03+00:00)
Title: Fixed horizontal pipe issue, where Mario can't get into 1-2 pipe to underworld

I think this is the issue:

if(!me.keys.run || !(me.resting || map.underwater)) return;

I'm not sure exactly what this was needed for. When I removed it, it didn't seem to cause issues in 1-2 or 2-2. And once I removed it the issue with Mario not being able to enter the pipe stopped.