Hi,

The characters don't seem to render correctly for me in the browser.

This is what I see when I open the demo link:

Let me know if you need any more information for debugging it.

If I remove those lines:

At least for me, in browser (firefox, linux), the game runs blazingly fast. Before, with the slow down as the snake grew, as long as I could survive to eat 2 or 3 times, then the speed became more reasonable, but with the new version which maintains full speed, I find it to be uncomfortably fast (but maybe it's just because I'm getting slow in my old age ;-) ). In addition, it seems that the randomization of food placement only happens when food is actually eaten, so I think you get the same sequence of food locations every game.

With the newly available speed, would it be feasible to tick the random number generator every game tick? You'd still only draw the food at the new location when the player ate the previous food, but the food placement will vary based on how many steps the snake has moved, rather than how many food the snake has eaten, thus adding randomization based on player actions. If a player managed to play identically, they would get an identical sequence of food, but most games would, I think, end up with more variation?

This only makes sense if there's some internal state to the random number generation, but it appears that's kept in dx, and if so, then generating more random numbers should change the sequence.

I'm not sure if it would help save any code size, but it doesn't seem like it would add any.

I have been experimenting for hours and it either stays at 85 or wrecks up the game. Is it possible to go further? IMO, the only way is to compromise functionality. Either way, the result is already impressive.

Why doesn't replacing

rcr BYTE [bx], 1
add bx, BYTE -0x50

work as well?

(the sub is replaced with add to set the carry flag and rcr 1 with carry flag set ensures the highest bit of [bx] is set)

test has a latency of .2 while and has a latency of 1 (and so does add and sub) we want to make the game slower so we won't use test

Badass code, but the demo is already in "hard mode". Could you make it a bit slower?

The demo should be slow and the current js hack is making the keyboard input laggy, also tried using Bret Johnson's SLOWDOWN utility with 100 cycles i.e.

Dos(canvas, { cycles: 100, onprogress: ()=>{} }).ready((fs, main) =>
    fs.extract("snake.zip").then(() =>
        main(["-c", "SLOWDOWN /Q/S:0/B:N snake"]).then(ci =>
            swipedetect(swipedir => swipedir && ci.simulateKeyPress(36 + swipedir))
        )
    )
);

But there is a speed bump whenever a key is entered on the keyboard

On initial start of the game, there is no food for the snake. You have to intentionally run into a wall and die in order to get food to show up.