After investigating an area, the player may or may not be rewarded with one of the Gems. Only two can be picked up during the first four missions, one is picked up in the following mission, and then two more are randomly received in two of the four following levels. The last Gem is received only upon defeating Thanos, thus completing the game. There is a special level, Avengers Mansion, where players can practice fighting certain bosses of the game. Sometimes, players will be rewarded with an item for succeeding.