Torus

From BoardGameGeek:

An abstract game played on a 2D board in a 3D area control environment. Originally designed as a teaching tool for advanced mathematical applications in biology. Now a challenging mobile strategy game for 2 or play in solo mode; your intuitive versus your analytical mind. The goal is to surround your opponent's play pieces and flip them to your color through strategic placement and movement on a toroidal shape, represented by the 100 square flat game board. -description from the publisher