Un! It's a game called Monster World. One player becomes the Dark Master, and controls the field, while the rest pick up setpieces like these -

[He picks up his own white mage figure.]

- and have to act out the role of adventurers. It uses a lot of math, but it's quite fun. The Dark Master has to make up the story and set encounters for you to face, while you as adventurers try to work together to bypass their traps and fight monsters to progress the story.