I used to think the solution to getting out of the repository was the worst puzzle in the game, but I was wrong. This is.

In the classic 350-point version, solving all the puzzles outlined in this hints section will give you 349 points, assuming you don't have to use the coins to replace your batteries, you don't die, all the treasures are in the building, and various other contingencies.

The missing point is gained by dropping the "Spelunker Today" magazines in Witt's End, at some point in the game before the end game kicks in.

Nasty, isn't it?