I checked it out and its pretty good. The 16 shades arent really stable and do end up looking like patterns (pictures look like they are underwater (which is cool )).

Current 8lvl routines are more stable and look better but of course this is a first release so there i no doubts things can be improved.

Yes it is possible to change where a djnz will jump to ... but with djnz, that might be dangerous.

Since 'code' is simply made up of bytes in RAM, you can change them just as you would any other byte.

Is 'score' only 1 byte?

You could try using RLD sorta like:

    ld hl,score
    inc (hl)
    ld e,(hl)
    rld
    ld (hl),e
    and %00001111
    sub 63
    neg
    ld (scoreMeter),a
Maybe?

Hey you're Portuguese? Cool!

I have some portuguese ancestry in my bloodline, but dont ask me when.

However i follow the EPL and watch Manchester United mainly, since my grandma used to follow them. Too bad chelsea won last night :S.

Cristiano Ronaldo is a superstar and he is the only reason Real Madrid are even in the title race. Had he not been injured for 2 months, things may have been different.

I look forward to watching portugal in the world cup .

I usually use a similar setup for sprites. I guess really it depends on what you require the sprite for since you may need all sorts of different sizes.

Most people either have a table full of sprite sizes (w,h) or prefix the information to the sprite data itself. This helps since you often have to refer to the sizes of your sprites for various things (for example collisions (though in most cases i have seperate data that stipulates the collision zones for any sprites)).

I still have a working NES with heaps of games, it is STILL awesome!

It certainly will.