Actually, there are photos
of one person's mapping
job of Level 1, and he claims that the maps are more like 200x200. Pete's page is a tribute
to Telengard at the following site which has several links to other resources (as well as a win32 port of the game) and the photos:
Imagine the following dimensions, 200x200x50. This is a non-random dungeon of monumental size. Pretty amazing for a game that was written entirely in BASIC in 1983, no?
More specifically, the particular line to hack to give you copious amounts of experience (using the C=64 emulated version) is:
just change the 10 to whatever multiplier you want.