A standalone travel version of Tak based upon the same pieces as in the Classic Set. Thus, it is slightly larger than the Tavern Set. Allows for 5x5 play. However, also works as an expansion of the base game to make 8x8 Tak possible.
From the Tak Kickstarter page:
The Crazy Martin Piece Pack: This item was introduced in Update #4. It's a set of 44 pieces (21 pieces and one capstone per side) matching the pieces in the Classic Set. That's enough for a 5x5 game by itself, but it's also enough to upgrade the 6x6 Classic Set into a game as large as 8x8. (Of course, you'll have to find an 8x8 board. This should not be hard)