In the game's releases on single screen systems (mobile and Switch), the Battle System has been modified to reflect the lack of a second screen. The current partner instead acts as a separate pin among Neku's other pins, which the player can call in to perform attacks by similar touchscreen actions like tapping on an enemy or slashing down on one. The player must balance the use of the partner pin with Neku's own attacks, going to their partner repeatedly to build up towards the Fusion attack. The Fusion attack is launched by tapping the partner pin on screen; the player then has a limited period to complete card-based minigames to build up a damage multiplier. For example, with Shiki as their partner, the player is shown one Zener card, along with a number of other Zener cards that are shown face-up for a moment before being turned over. The player must select those face-down cards that were matches for the shown Zener card. The Switch version further offers a co-operative mode, where a second player, using a Joy-Con, has control over the partner character and a limited set of pin attacks during battle.