Man can anyone have any fun these days without people coming in and saying the gravity is wrong, the arrow keys are broken, the lines don't disappear if you manage to get them all lined up, that its not that impressive this was put together because it's a mere physics simulation, and so on.

Does the high quality of posts on HN tilt us towards criticism instead of praise, even when it's not warranted? Clearly this was not posted for a code review.

Does Randall realize the power he has? If he wants something to be made or done, all he has to do is post a drawing of his idea, and someone brings it to life.

Sadly, even if you can arrange for some blocks to line up in an approximate row, they don't disappear! Satan, you do not play fair, sir!

Original comic: http://www.xkcd.com/724/

Gravity needs to be just a little stronger.

I see Hell is located in a low-g environment

My observations of the game mechanics.

0. Once a piece touches another piece, you lose control of it.

1. The weight of one piece can affect the balance of others.

2. If you hold a piece against the side walls, it will stop descending.

3. If you move a piece into the wall and then immediately away from it, you can put it into a slow spin while still being able to flip the piece.

4. You can control the descent speed by tapping the down arrow. After each acceleration, the downward velocity resets when you stop accelerating. If you reduce the speed with which the pieces collide, the already stable pieces will not bounce as much.

5. Getting something really close to a complete horizontal row does not cause the row to disappear. I have not yet achieved an arguably perfect horizontal row.

It's a pretty fun little toy. More amazing though, is just how quickly this was hacked together. The comic was what, two days ago?

Incredible.

Alternative tetris hell: http://qntm.org/files/hatetris/hatetris.html

Fun stuff. Has a fair number of bugs especially when the blocks are around the edges of the pit. And I think the edge of the bottom half circle always applies its reaction force upwards and not radially so it feels a bit unnatural (also the blocks cannot slide because of that). Still cool stuff though.

now, all that's left is "sudo make me a sandwich"

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if you keep the right / left key pressed then the bricks dont move down! lol..

good job!

This is genius.