Loe: Legend of Enomoto (1999)

The protagonist received an invitation to enter a contest to win a very rich man's inheritance. The contest consist of quizs and games. Other contestants will compete with him. He can either do it alone or with someone's help. This game consists many different kinds of puzzles like Japanese phase puzzle, math puzzle, room escape puzzle, finding item puzzle, etc. The player must solve all puzzles correctly in order to progress the story. For example, if you fail the first entry level word puzzle, you will immediately reach the bad end.