World XT

Access
All platforms: Beat World B PC (early): Type "quree" or "star4th" while in the hub world, then exit

Mechanics

 * Beat Interval: 1, ½, ¾, 1½, ¼, 2, ⅓, ⅔.
 * Checkpoints are present (5).
 * Swirls are present.
 * Rabbits and Double Rabbits are present.
 * Snails and Double Snails are present.