Advance Wars is a turn-based tactics video game.
The available modes of play include "Field Training" which is a tutorial mode, a campaign mode which carries the game's storyline, the "War Room" which is a collection of maps on which the player strives for high scores, as well as multiplayer modes and a map design mode. The "Campaign" and "War Room" modes both help to rank the player up (from Rank #100 to Rank #1) and to earn coins to unlock COs and maps in the "Battle Maps" shop.
The modes also gives the player a rank for effort after winning a battle on that map, which assesses by the speed, power and technique in that battle, speed being the number of days spent trying to win the battle, power being how many enemy units you defeated, and technique is the number of your units that survived (in percentage).