FightCodeGame ?
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Anyone checked out http://fightcodegame.com/ ? The web site seems pretty sleek and it all looks pretty active and well organized. After watching some sample battles, and that the #1 ranked bot is ~350 lines of code, I have to wonder how high a ceiling there is in terms of writing sophisticated robots. The gameplay looks pretty much like a Robocode (or whatever predecessor) clone with only blocking API calls.
It kind of annoys me, on principle, that I have to authorize it with my GitHub account even to see things that are read-only, like the rankings. So I haven't done that yet and thus haven't looked into it in much depth.
Well I have never had much success with normal Robots. Mostly since it seemed like a lot of extra effort for little gain. That is, the rumble was dominated by AdvancedRobots and their non-blocking calls.
I took a look at it, and it is difficult (for me) to write a decent robot on it. Mostly because I would like some kind of debug feature. Supposedly it has a log function to write to a console. But I can't figure out how to access said console.
I played a different Javascript / web-based programming game and also had problems with that aspect. I think it's the browser Javascript console that you need to look at.
(And it was crashing my browser / useless to me for a while before I realized I'd printed like 30k lines to it, which it isn't really designed for, and finally figured out how to clear it.)