ArenaNet loves to go all out for holiday events but this one takes the cake. A group of four friends and I spent four hours in it last night and we only got halfway through the "game". The game itself plays like what would happen if you took Super Mario Bros and Zelda, mixed them together and added in a touch of Golden Axe/Gauntlet/Castlevania. I even got a Mario 64 vibe from it too.
It's a blast and I wish it was staying. It's more than an April Fools joke, it's a love letter to old school games, there are plenty of hilarious references too. For example, go into a shop and you'll find you can smash not only pots, but everything the shop keeper owns. All the while he'll be making passive aggressive quips at you.