Since I so evidently like making arenas, I decided to start work on this spleef arena a few months ago since I hadn't tried making one yet. This build uses mainly just obsidian and netherbrick in its design, I've actually tried to keep things fairly minimalistic.

Being my first attempt, it may look nice as an arena but perhaps the function may be lacking a little. There are command block teleporters that can be set up to allow people to move around between otherwise inaccessible areas, and also a piston gate setup in the central hub, controllable from the lever on top of the netherbrick platform. I'll be sure to add actual walkways later in a clever way when I get around to it. :)

Please leave any thoughts and suggestions you may have for this, as I'd love some external input to help better this build. Thanks, and enjoy!

Additional Notes

When importing/pasting in this arena into your world or server, it will be placed one block below you but centered, so stand on top of one block in the exact center of where you want it.