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A "click and hold" to lock a tile into place would also be great and mobile accessible

It already does that on mobile. It allows marking edges as connecting or not, and locking tiles with a long press.

I found the edge marking on mobile to just be a random source of confusion. Kept doing it by accident.

Sorry about this. I sometimes place them accidentally too.

I have an idea of placing them with some kind of gesture - like touch and drag between tiles. That wouldn't interfere with tapping to rotate tiles. But on the other hand, I'm usually zoomed in on mobile and I use touch and drag to move around. Interfering with that would be bad too.

I'm open to ideas for better controls.

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