Diep.io

In this clip: This Diep.io clip shows a grey arena from a landscape recording that carries its own burned-in caption text. Early on, red circles with grey barrels are spread among yellow squares, red triangles and a blue pentagon. Later frames show a pink banner reading roughly "RED HAS WON THE GAME!" and "Arena closed: No players can join", with many large yellow circles on screen and, in the last frame, a single red barrelled circle surrounded by them.