Thanks, eiyeron and Nick, Nick, I think I'll use yours, that looks about right

OK, I'm reviving this project, not that it was ever dead, but it's in active development. There's going to be no scrolling, because it slowed down too much and made the gray look bad.

Anyways, I've changed the animation thing that happens when you toggle a block so it's twice as fast (and also severely bada** ) in terms of game element limitations, you're only going to be able to place blocks after you delete them, on a one-to-one ratio. So for every block you delete, you can place one somewhere else.

I'm also going to add buttons, and blocks that you have to push or pull around that open doors. Other ideas? For tiles, there is also bouncy tiles and spikes. Honestly I think I have enough game elements, I'm going to try to do really good puzzles with the level design.

One more thing - I'm at the point where I want to change the name. There's nothing wrong with the name YAZP, but it's always been kind of a placeholder, and seems to me to be kind of a cop-out...Anyways. If you have any ideas, post them here.

Honestly it didn't do much to clarify anything, I'm more confused than I was before

Yeah, that's a cool effect you got from SMB. How exactly are you doing it?

I got a weird email from them...apparently they are still giving out PRIZMs??? This is all very confusing.

Hi all,
 
This is a quick note to clarify that if you've already received a note asking you to choose between the Prizm calculator and the software then you're still able to receive that calculator.  We've had such a demand for the calculator in the past several weeks that I already assumed you would choose it (and wanted to let everybody know ASAP so as few people as possible would be caught high and dry at the end).
 
Sorry for worrying you!  Please go ahead and reply to my final "Congratulations" email with your selection, address and phone number and we'll get you taken care of.
 
Kind Regards,
Nathan

What exactly does it do?

My bad Builder

OK, for gravity, you need to increase the Y_Offset, which looks like it's the variable B, and for border checking, you need to check to see if the character's X and Y coordinates denote that the character is off the screen. If the character is off the screen, put him back on the screen by changing the X and Y coordinates as such, and set the respective velocity to zero.

And yeah, try Quigibo's code cept make sure to account for inflation.