Oh man, I just want to give a shout out to the Splatoon ink mechanic.

The game is a competitive arena shooter. That would be pretty uninteresting, but instead of competing for kills or holding objectives, the teams are competing to cover the largest surface area with ink or paint. That's pretty neat. But there's more.

Every player has a special "squid mode" they can use when standing on ink of their colour. When in squid mode players travel much faster, can travel up walls, and are extremely hard to spot, but can not attack or lay new ink.

This makes the laying ink in specific areas valuable, as it makes it faster to get from the spawn point to the front faster and easier. It also rewards holding contiguous trails of ink, or conversely, cutting off your opponent's ink trails.