Kaiserplatz
Kaiserplatz is the landmark that turns a loose Green Key into Blue Key progress, so it only pays when your run can survive the whole key chain.
Blue Key only pays off when your Kaiserplatz stop was clean enough to justify pushing the chain one landmark deeper.
Blue Key is where the colored route starts charging real time and risk. Picking it up means your run is no longer just finishing Kaiserplatz. It is deciding whether Meere Sauge is still worth the extra fight and travel. If Kaiserplatz already felt expensive, Blue Key is usually where disciplined teams stop.
Blue Key sits inside the room opened by Green Key at Kaiserplatz. From there, it sends the route toward the blue-door step at Meere Sauge.
Kaiserplatz is the landmark that turns a loose Green Key into Blue Key progress, so it only pays when your run can survive the whole key chain.
Green Key only matters when you are ready to turn a safe drop into the first real landmark step of the colored chain.
Meere Sauge is the point where the colored chain starts getting expensive enough to punish greed.
Red Key only deserves space when your run is still strong enough to keep climbing toward White Key instead of extracting profit now.
Black Key is only worth carrying when your run is already strong enough to turn Fort Istria into a Dreadnought vault finish.
Dreadnought Key is a separate Storm Dive endgame key, so it only matters when your run can still survive the ship and the extraction after it.
Green Key only matters when you are ready to turn a safe drop into the first real landmark step of the colored chain.
Keys are route commitments, because each useful key only pays off if the crew can still reach its exact box, door, fort, or vault before the run collapses.
Red Key only deserves space when your run is still strong enough to keep climbing toward White Key instead of extracting profit now.
White Key only matters when your run can still turn Segen into a Fort Istria finish instead of dying one step before Black Key.
Blue Key means the route already spent resources reaching its first real lock. From here on, every step has to pay for itself.
Stop after Blue Key if the hold is already profitable and the Trampler is shaky. The next landmark only matters if the run can survive both the travel and the fight.
Blue Key is found in the room opened by Green Key at Kaiserplatz.
Blue Key opens the blue-door step at Meere Sauge.