haha, i like the one in the middle, where he climbs up all of the ladders and the next room is like FULL OF LADDERS OH GOD

"Клад" ("Treasure") was a very popular game back in the day (not just in Russia, IBM PCs had it, too); I even remember playing it on a friend's computer when I was about 5 years old.

There's a modern game resembling it quite a bit, called Spelunky