TricleThree intersecting circles with visible orientation.
TrillionMove the same-colour pieces from the lines to the circles.
TrioSimilar to the Puzzler from Douglas Engel but with 3 circles.
Triple CrossUse two up-down plungers and a left-right plunger to set the 3 orange dots, a green circle and the words "Binary Arts". A grey and a blue version exists.
TRIvial circlesA 2D puzzle with two overlapping circles that share one of their 3 leaves.
Try-AngleA puzzle of four intersecting circles inspired by the fidget spinner.