Lines of Fixation
Lines of Fixation is a game inspired by Lines of Action, a classic abstract game by Claude Soucie.
Start with 9 of 2-height stacks for each, moving the stacks with merge and capturing to unite your stacks as a group. You can also win by having 2 of 6-height bi-color stacks.
However, your stacks cannot move along a line when you do not have the tallest stack on the line.