Super Mario 3D World X is a game for the Nintendo DSX10 and Wii X. It is the first appearenc of Princess Charmine and first 3D appearence of Princess Krystaline.
Princess Daisy: unlocked after beating at least one world using only luigi.
Rosalina: unlocked after finding her wand in the world 4-4 castle.
Wario: unlocked after collecting 100 coins.
Waluigi: unlocked after collecting 200 coins.
Princess Krystaline: unlocked after beating at least one world using only Princess Peach.
Pauline: unlocked after collecting 300 coins.
Gameplay modes and side features
Normal: the normal game, with no changes to the gameplay.
Super Princess Krystaline: simmalar to Super Mario 3D World's Luigi Bros. character swap, Super Princess Krystaline is an edit of Super Mario Bros. with Krystaline and Charmine replacing mario and luigi.
Challenge: A Multiplayer Mode with extremly difficult levels
Free Play: a free roam mode in an open space. There isn't any difficulty or challenge, but you can get plenty of coins, powerups, and other goodies.
Character editor: a character creator type feature allowing you to create you're own character to play as in the game, complete with the ability to create you're characters powerup designs.