war game

Short definition from Wiktionary

Noun

1. 1
   A simulation (by whatever means, physical or digital), for training and strategy purposes, of a military operation involving two or more opposing forces using rules, data, and procedures designed to depict an actual or assumed real-life situation.
2. 2
   A game, for entertainment or edutainment purposes, that simulates or represents a military operation.
3. 3
   Alternative form of war game.

Verb

1. 1
   To run a military simulation of this kind.