Free. No account. No point.
Antithesis Arcade
Four small games about questioning things. They are not very useful, which is rather the idea.
The Stroop Test
Tap the color of the ink, not the word. Thirty seconds. Reading is a habit, and habits are hard to interrupt.
Tap start.
The hat version of this is Blue, which is black, and says Blue, in red.
The Red Puzzle
Sixteen pieces, all one color, each dropped in at a random angle. Tap a piece to pick it up, tap it again to turn it a quarter turn, then tap a square to set it down. The tabs and notches are the only information you are getting.
Start with a corner. Two flat edges, one way up.
There is a real one, 520 pieces, solid red: The Red Puzzle.
Path to Nowhere
Steer the line. Collect the red. Avoid the beige, which multiplies. The edges of the screen are not walls, they are just edges.
Arrow keys, WASD, or swipe.
The sweater version of a line going its own way is Lost Lines.
Panta Rhei
Fifteen problems. Drag to draw, press release, and the ball obeys gravity rather than you. Beige is solid. The red ring is the point. You get a limited amount of line, so the question is never whether you can draw a path, it is which path.
Named for the sweater, which is named for the river: Panta Rhei.