The lovely people at Nintendo gave everyone with a DSi/XL/3DS a free copy of this updated version of the GBA Four Swords game, to tie in with the Legend of Zelda 25th Anniversary. How lovely!
The main difference between this and the GBA one is that they’ve added a single player mode. Well, it’s sort of single player two player co-op, with you controlling two Links at the same time. It’s pretty good too, although I’ve only played for an hour or so.
It’s not really a “proper” Zelda, because although it has Link, and the graphics and sounds are Zelda-y, there’s no proper exploration or dungeons or an overworld – just several timed self-enclosed stages where you smack things, solve a few puzzles, and can only swap weapons and “powers” by physically swapping your current one with another sat on a pillar.
Free though! And Zelda! In 2D! Rejoice!