So I recently rediscovered the magic that is Puyo Puyo! However, I'm absolutely terrible at it. I'm a pretty slow thinker and can never analyse the situation quickly enough to predict the fall of blocks and construct large chains.
So, I wrote this little training tool that allows you to play Puyo in single-player as slowly as you like! You can spend an infinite amount of time deliberating each move, and even go upwards.
Threw in some sfx and autotiling for fun :)
[update 2017-02-22]

configurable rotation controls, mainly for those using the web player on mobile devices

[update 2016-08-13]

the 13th row (outside the top of the board) is now treated correctly
chain text can't go off-screen (animation fix)

[update 2016-08-12]

revamped menu settings
fixed nuisance puyos not popping (oops)
added 'blind piece' mode which greys out the current piece, forcing into the habit of looking ahead

[update 2016-07-29]

the first two pairs can only consist of red, green and blue puyos, regardless of colour count
puyos placed outside the top of the board will be removed (hopefully correctly)
improved controls some more
adjusted purple puyo graphics (thanks to MissingNumbers for input!)
optimised the way puyos are stored (no more lag when the board gets full)

[update 2016-07-23]

can now choose the number of colours to play with
can optionally play with random nuisance puyos added to the field, to simulate an opponent (for all you people that complained it was too easy)
improved controls, fixed some bugs, now possible to fail