Campaign is the sequential unlock route with entry energy, attachment progression and a required knockout. Arena challenges published builds asynchronously, normalizes attachment levels and uses remaining core-health fractions at timeout.
Compare the rules that change your build
The same collection supports both modes, but the rules reward different decisions. Use this comparison before assuming a successful Campaign setup will behave identically against a published Arena boss.
| Rule | Campaign | Arena |
|---|---|---|
| Opponents | Sequential authored boss route | Published players and labeled lab rivals |
| Attachment levels | Progression boosts apply | Normalized |
| Entry energy | Campaign meter | No Campaign energy cost |
| Timeout | Boss holds; knockout required | Core-health fractions compared |
| Main purpose | Route, unlocks and stars | Build matchups, publication and rating |
Build for the actual win condition
Campaign’s timer can defeat a very durable machine that fails to finish the boss. Improving defense alone can therefore leave a wall unsolved. You need enough effective damage within 30 seconds as well as survival.
Arena’s timeout rule compares core-health fractions rather than raw remaining HP. A bigger starting health pool is not the same as automatically winning the comparison. Keep track of the portion of core health preserved and the opponent’s damage path.
Use each mode for what you need now
Continue Campaign when your goal is a reachable first-clear unlock or another district chest. Use reached encounters to revisit stars and test familiar mechanics. Try Arena when you want published-build variety or a fight without spending Campaign entry energy.
Keep your conclusions mode-specific. A leveled weapon rescuing a Campaign run is good progression evidence, but it is not evidence of a ranked level advantage. Conversely, a new Brain that improves range control can be useful across both modes because the behavior itself remains.