Curving arrows through the gravitational fields of planetoids to peg my mate in the face, I am delighted with Sagittarius [official site]. It’s a free game of turn-based archery for 2-5 local players, and it is tricky. Move around the surface of your sphere with the arrow keys, click and drag the mouse to aim and draw back, then hope that your shot will find its way through gravity’s ripples to an enemy. Or laugh as it wibbles, wobbles, and somehow ends up a metre from where you fired it. Did you remember to pick a safe spot to wait out your pal’s turn?