Maps define the lane layout, base size, and wave ceiling. The base game ships with multiple islands and the late-game Jotunheim and Sky Spire maps.
Base Island is the default map. Two lanes, small base size. Best for the no-checkpoint Wave 1-25 window. Redeem CRAFTNERF! early here.
City Island is the Wave 25 unlock. Three lanes, medium base size. Checkpoint unlocks after Wave 25 clear, so you no longer face the full restart risk.
Wasteland Island opens after the Wave 50 checkpoint. Wider lanes favor AoE compositions. This is where Corrupted / Void Emperor traits pay off.
Jotunheim Island is the open-world farm map. High-density NPC clusters drop Sky Keys at 100%. Required for Sky Spire entry.
Sky Spire is a vertical tower map with floor-locked bosses. Floor 41 and Floor 50 drop Holy Grails at 3.45% and 5.05% respectively. Requires 100 Holy Grails for Excalibur.
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