Haven't followed this thread (at all), so sorry if someone already asked this:
Has anyone started developing an online multiplayer game for the CPC now?
"CPC World"
Some time ago when I was playing with some Wiznet modules, Spectranet developer told me to try to port the Spectank game. With the M4 WiFi I focused to start porting the BSD sockets lib to SDCC/Cpctelera but recently I lost the pendrive with the latest updates. Until I recover motivation to redo a lot of work, I have used the little time I have playing with concepts that ended making the video above, dumping a GXcart with the M4 xD
The spectank is a fun game, client server oriented. The server can be run at a Raspberry Pi, and makes all the IA and game evaluation. The clients are mere terminals, send keystrokes to the server and "plays" the levels and sprites. The client receives messages from the server which can be initialization messages of tilemap, sprites etc, and later update messages, of sprites changin coordinates, the animation of the sprite, etc.
A nice concept of 8bit netplay. Change tanks with soldiers, rotational movement with directional, firetank with bullets, and grenades as secondary fire like commando or ikary, and you have CPC Call Of Duty 2D xD
Pity is that you need UDP....