I've still got to implement the tile detection to make sure it's only being drawn on appropriate tiles (essentially walls) and i'd like to add a little sprite of a spraypaint can (and perhaps a little spray animation) when painting.

Due to the camera view, i'm not sure if it'll be possible to paint left/right/down. I don't know what you all think about that..? Or if you've got an ideas i'd love to hear...

I'll try to clean this up a little bit and add in cops.

I'll always be amazed by those awesome camera movement. Amazing work

Thanks guys. I've still got a few other projects to finish up, but i'll get around to it. I also wanted to post another screenshot showing the different height levels you can have. It's still buggy, but here you can see it in action.

I'd also be interested in talking about possible pathfinding routines, i've been wracking my brains the past week or two and haven't come up with anything satisfactory.

For path finding, I have only successfully done it on a tiled maze. Essentially, I had the human player and the non human player 'chasing.' Chasing is done by moving in the optimal direction to be closer to the human player. The trick is when the chaser gets stuck, I would draw on some other buffer marking the position and the chaser would not be able to stay on that tile, so they would move backwards or left/right and each tile visited for the next 8 or 16 turns would be marked as well and they would remain marked for 8 or 16 turns (think of a snake from a snake game being placed on the other buffer growing for 8 or 16 turns, then shrinking).

This allows the chaser a little more intelligence to get unstuck, and when you have multiple chasers, the others can avoid getting stuck, too, while potentially taking other routes. I actually got the idea from a cellular automata experiment where I had a few hundred cells navigating a maze and the majority of them were able to find the exit. That, however, is too taxing on the CPU for use in a game on these calculators.

I wish I still had a working example

That's cool    will it do anything else? Different levels and more enemies?

For other enemies, all i can think of are security guards or maybe a special anti-graffiti squad, rival crews, etc.

It's sound very great !

How you want to implement cops fighting though    ?

For attacking cops/other enemies you would just pick up items (like bats or knives) as you go, maybe stash them in a backpack or just be able to hold one thing at a time. I initially wanted to add in other graffiti types, in particular larger tags and burners. The sprite routines and tag data is set to handle different sizes. I was planning on using [Y=] to [Graph] to let you pick/set different tags/burners. I'm wondering if there'd be a more interactive/fun way to go about it, right now you have to hold down that button (currently only [Y=] works) to continue painting. I was thinking if you spend too long away from a tag before finishing it it'll get washed away.

I'm also not sure if cops should attack you by default or only if they catch you doing graffiti. Also, attacking a cop might make them call in for backup, which might mean a spot gets hot for a while and you need to either lay low or leave the area for a while. I also like ideas of having attributes, again similar to Tony Hawk, where you can do things like paint faster, carry more paint with you, run faster/jump higher, etc.

Lots of ideas, just gotta start working them in.

EDIT: i'd also like to try to reuse this engine to set up a skateboarding-type game. I can foresee a couple problems (apart from probably being limited to 8 directions), but i think it'd be fun nonetheless.