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It's cool to toy with Tetris. Did it myself as a student, can't remember all the stuff I tried. But one thing I did was to make the blocks go invisible a few seconds after landing. Fun to try and remember the state of the board.
There are variations on Tetris (e.g. the Tetris Grand Master franchise) where the game mode gets more challenging as you clear. One of the challenges is that the board is invisible, and pieces disappear as soon as you place them; in order to get the best ending, you have to clear a certain number of rows _quickly enough, while still getting tetrises_, while the board is invisible. There are videos on youtube of People doing this.

Another interesting one is that it changes all of the blocks to be monochromatic, including in the "Next Block" preview. It turns out that mode is actually more challenging than you might think; at the speed the blocks are dropping, you depend on peripheral vision to tell you what blocks are upcoming, and now you have to actually examine the block to figure out what it is instead of just knowing from the colour.

As we are on the topic of Tetris, you can always play the good old Tetris online here http://www.goodoldtetris.com/
I got so excited about this, but Mobile Safari keeps zooming when I double-press a button!
Flash version, if your browser still supports it: http://blahg.res0l.net/2009/01/bastet-bastard-tetris/.
Hey, that's me! :) I haven't looked at this in ages. That's a walk down memory lane.
I cleared a line and got 50 points

I am declaring myself victorious

wow that really was infuriating
huh. "just send the same piece over and over again" is a less interesting implemetation of "least useful piece" than i would have expected.
If it did that it would be extremely easy, play longer.
For me this breaks after completing 10 or 11 lines, pieces no longer appear or fall unless I press some keys. Edge on Windows 10 with Flash 32.0.0.101 64 bit.
Debian & its friends have it as “bastet” package if you want to give it a try.
Even knowing what I was getting into, this game is truly infuriating! That's quite amazing.
The game is very good at giving you a false hope while playing. Then it takes the hope little by little :D
When I first discovered bastet, I thought it stood for 'bash tetris'. I thought I was just really bad at tetris.
This is also available on the Homebrew repo for those of you on macOS. "brew install bastet"
There is also Hatetris[1], with the same premise.

Which I discovered because, for Hatetris, he wrote a nice twitter-oriented compact binary-to-text encoding, base65536[2].

[1] https://qntm.org/hatetris

[2] https://github.com/qntm/base65536

What's the version where, every time you complete a row, it just zooms out so the row isn't complete any more?
I was never a fan of this version, it seems to spawn the little S shape almost constantly :(
> Yes, you will get a lot of S pieces. But it doesn't give you solely S pieces - if that were the case, then it would be possible to make lines forever, which is much too easy.

> If you can't figure out how to turn a constant stream of S pieces to your advantage, that's your problem. Rest assured that once you do, other pieces will appear. If you get creative, it is possible to force all 7 different pieces to appear, including even those incredibly useful T pieces.

I understand both of those points : )
I've never gotten a better score than 3, nor a T block in hatetris.

[edit] Today managed a score of 7 with playing around with it.

I had to once code a ‘wheel of fortune’ UI, that simply revealed trivia in random order. You had the perception of control: you could set a speed for the initial spin and see it gradually stop – as if it was adhering to physical laws – on an item that you haven't seen yet. The same item never came up twice. You always got to see all items on the first try. It was so easy to trick the mind into thinking you had control.
Looks like the way to get anywhere in the game is to intentionally play pieces in odd ways to throw off the algorithm.
tetripz! is another interesting take on the game.
I'd like a port of this as a mobile web app. So I can share it with family.
Maybe a bastard tetris can be made within these 7-bag rules:

http://tetris.wikia.com/wiki/Random_Generator

Probably won't be very bastard at all though, e.g. there must be an I in each group of 7

Yes, but at least it would be fair. I've tried Bastet for a few rounds and the fact the game can just throw the same piece at you 5+ times in a row makes it feel really cheap.
Somewhere recently I saw a tetris variant that, in addition to normal play, allowed for competitive play, where your opponent selects the blocks. There was an option for playing against an AI, which seems very similar to this. I wish I could remember what the name of it was.