Approaches for secondary-game-mode sessions based on primary-game-mode arrangements of user-controlled elements are provided. Actions by user-controlled elements of a first user or other game-space elements in a primary game mode of a game space may be managed. A session request for a session in a secondary game mode of the game space may be received from the first user. A first session for the first user may be executed in the secondary game mode such that: (i) the first session involves artificial-intelligence-controlled elements as opponents against the user-controlled elements; (ii) an arrangement of the user-controlled elements at a beginning of the first session is the same as an arrangement of the user-controlled elements in the primary game mode at a time of the session request; and (iii) impacts on the user-controlled elements during the first session in the secondary game mode are not reflected in the primary game mode.