You can upgrade, but it is not a good idea to upgrade the "normal" way. You can use nlaunch(y) to upgrade your calculator in a safe way that will most of all give Ndless the reboot-proof property. Using nlaunch(y), you can even have some sort of dual-boot and keep both OSes on your calc, in case you sometimes want to go back to 3.1 (or the contrary, in case you are still using 3.1 but sometimes want to use 3.6).

If you already updated the normal way, don't worr, there's a way to downgrade (with nsNandMgr iirc), to go back to 3.1 and do what I said about nlaunch(y) afterwards.

And you should backup your files, upgrade or not, accidents come fast
No need to delete them though.

Haha ! I received something in my mail yesterday too, it was two official GameCube controllers. I guess we both had the same reaction, like "We're gonna have fun with this thing" (quote from Wolf O'Donnell)

Also, just a side note. To help everyone (including yourself) understanding your code, you can use self-explanatory names (up to 13 characters) to you labels (and have custom-named variables too but that needs declaration and understanding memory and such), and I think that FAR is far from being self-explanatory (even though the content of the routine is).

Bug report !
I had on the bottom row, in that order, 2, 8, 256, nothing, and when I pressed right, I had nothing, nothing, 2, 8 and the 256 was offboard.
I don't remember what I had on the other rows though.

J'avais dans cet ordre là sur la dernière ligne, 2, 8, 256, rien, et quand j'ai appuyé sur droite j'ai obtenu rien, rien, 2, 8, et le 256 était à côté du plateau.
Je ne me souviens plus de ce que j'avais sur les autres lignes par contre.

Well, help?

I'd say that you should just try to make something really stupid, not something geniusly optimized fast and small.. Like a If for each directionnal key and 4 times "the same" code. Then, you'll optimize that if you want.
Let's take the left key as an example. What you do is go through your board from left to right, and move the tiles you encounter to the left if they can move. I'd suggest you actually have two boards, one being the board before the movement, and the other one being the board after the movement (and then you store the "after" in the "main").
Same for the right key, except that you go through your board from right to left this time, and you move your tiles to the right, obviously.

Could you implement game saving ? Like, I quit the game then come back and I continue the previous game and don't have to start over ?
__

Tu pourrais implémenter la sauvegarde ? Genre je quitte, je reviens et je continue ma partie au lieu d'en recommencer une ?

Not ABH but AHB.

Fail. Thanks. But that was understandable I guess (the only thing that has three uppercase letters including A,H,B in Nover).

1) If you are using Nover, disable it for a moment and remove it from the startup folder
2) Press reset
3) Delete your document. Check if it's gone for real, it should be
4) If you are using Nover, re-enable it but with a lower ABH frequency

Note, I am not an Nspire pro, so I think what I said is right but I am not sure if that really works
At least it shouldn't hurt.

Phew. I dyed my hair green and use Ubuntu, which is Linux not Lunix, so everything is ok for me. Plus, I bought an ATI as a graphic card, not an AMD, and never asked my parents to change their ISP because I don't live in their house most of the time so I could choose one I like without asking them.