Landing on Mini-game Spaces in this game will cause a Single-player mini-game to occur meaning only 1 player has a chance to earn extra coins.
Mario Party 3
In Mario Party 3, Mini-game Spaces are only found in Duel Mode boards. Landing on one will start a Duel Mini-game where one of the two players has a chance to earn 10 coins to help keep their partners in the game. Since Duel Mode doesn't have mini-games at the end of turns, landing on a Mini-game space is one of two ways to play mini-games with the other being going past Belltop five times.