Quick answer
Endless Mode is officially listed as a full-game feature for pushing buildcraft beyond normal stage limits. The useful prep is the same: scalable damage, movement speed, reliable coverage and a grid that still has room to improve.
What is confirmed
The official Steam description says Endless Mode lets players test buildcraft to its limit.
What is not confirmed yet
Pre-release sources do not provide a complete Endless Mode rule set, reward table or enemy scaling formula.
Build priorities
Prefer effects that scale with more parts or longer fights over one-off early-run convenience.
Survival
Movement speed and crowd control become increasingly important as screen density rises.
Update plan
This page should be expanded immediately after launch with verified unlock conditions, scaling and rewards.
Pre-release note: Cloudbreaker launches September 15, 2026. Exact costs, balance values, unlock order and boss timings can change from the demo.
Sources: Official Steam store · Long-form demo gameplay/transcripts reviewed Sep 13, 2026