I added that, as well, as it's a pretty obvious thing for the player to try. FWIW, 'look under' is actually one of the supported verb phrases in the Inform 6 standard library, but it's not in PunyInform. Keep that in mind if you ever need to port a game from the standard library to PunyInform or vice versa. The only other significant difference I came across was certain uses of 'climb', but that will be in the next release.