Lemmie look at them. I was going to try to install damn small linux or something else on it but I don't know how to boot from a CD or DVD from mac
Noo, don't install linux on there solely for running a Blockland server, it won't work if your Mac has powerpc, does it? If it does the reason why it won't work is because you need to install a program called Wine which runs windows programs on linux in order to get the dedicated working however wine wasn't designed for powerpc processors and the same for the windows programs. Your best bet right now is to just stay on 10.4, again I need know if you have a powerpc processor and if the game even works on there. If your PC is powerpc and the game works then just stay on 10.4, if its not powerpc and the game doesn't work then you can try upgrading to Leopard (you can upgrade to leopard on powerpc but I dont really see the point) or install Linux (id pick Debian or CentOS, you can run a Blockland Speedkart server holding 3-4 people with ony 240mb of system memory, maybe even a bit more)