Nintendo X Sega

Nintendo X Sega is a crossover action RPG/tactical RPG hybrid developed by Sega and released by Nintendo only for Wii U & 3DS, featuring characters from games produced by both Nintendo and Sega.

Gameplay
Namco × Capcom is a hybrid of an action-RPG and a strategy-RPG. Movement is done on a square grid with turns being determined by figuring out which character has the highest AP. On the player's turn, he/she can move the character into position and choose to attack an enemy.

At this point, the game switches into the action-RPG portion (in style of Super Smash Bros.). The player's character has a number of "Branches" they can use. Each direction on the directional pad combined with the circle button will perform an attack. Each attack uses up 1 branch. If the player can perform a certain number of Aerial Chains (hitting the enemy in mid-air), bonuses may be gained, such as items, super meter, extra damage, or more branches to use in the turn. Bonuses other than items are converted into extra Experience Points at the end of an attack sequence. Upon filling up the character's Special Gauge they can use the Triangle button to perform a special attack. They will also be able to select a Multiple Assault attack if their units on the board meet the conditions. Defense also puts the player in the action-RPG mode, this time blocking to reduce the enemy's damage as well as countering attacks. Successfully blocking attacks will also increase the amount of AP the player's unit has while successfully countering the enemy's attack would force him to finish his turn.

There are 50 levels total (45 normal and 5 prologue) and the game could take from around 70-100 hours to complete.