If you want a WEIRD but cool experience, you can play the Free QUBE 2 with a Tobii eye tracker. This allows you to move the cube by focusing your attention. WEIRD. I actually didn't care for the puzzles much, but I found the tech interesting.
It's not worth it. I had a laptop with it built in. Few games compatibly, weird effects, not super accurate. Still really cool if you have it. Like being in the future.
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By the way, I recommend adding "" to the beginning of titles for deals like this.
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https://gaming.tobii.co