The Checkpoint Flag in PEAK is a single‑use respawn item that lets you come back to where you placed it instead of restarting your run from the beginning when you die.

What the Checkpoint Flag Does

  • It is a placeable item that creates a temporary respawn point anywhere in the level.
  • When you (or in some cases a teammate) die after it is placed, you respawn next to the flag instead of turning into a ghost or restarting the climb.
  • After it triggers once, the flag disappears, making it strictly one‑time use.

Extra Mechanics And Limits

  • The flag usually persists until it is used or until you transition into a new biome/area, at which point placed flags are cleared and you need to plant another.
  • It can be placed on most valid surfaces, using the interact/“plant” button while standing still on solid ground.
  • In co‑op, only one player benefits from a given flag activation, so coordination matters if multiple players are at risk.

Best Ways To Use It

  • Plant it right before dangerous climbs, long jumps, or platforming sections where a fall would normally cost you the whole run.
  • Use it near areas with heavy hazards like poison spores, unstable terrain, or enemy‑dense zones (spiders, scorpions, zombies, etc.) where sudden deaths are common.
  • Treat it like a “second chance” token: if you clear the risky section safely, you can just leave it unused and move on, knowing it is there if something goes wrong behind you.

TL;DR: The Checkpoint Flag gives you one extra life at the spot you choose; once it saves you from death and respawns you there, it vanishes and must be replaced for the next risky section.

Information gathered from public forums or data available on the internet and portrayed here.