Fortress Challenges

Small experiments. Better defenses.

Try one question on your next run, then compare what you notice. These are optional practice prompts for the website, not in-game missions; they do not award in-game rewards.

01 · Protect the weakest side

Before Build: choose the sector that looks most vulnerable. Make one deliberate change to its defense. After Attack, check whether that side held up better and what still troubled it.

02 · Bigger or better covered?

Before an equal-tier merge, look at the coverage you might lose. Choose based on the approaching threat, then watch the result. Keep a screenshot or a short note about what you would try differently.

03 · Read a warning

Pick one special infected you meet. Notice its warning before the attack lands. What did the cue tell you, and how early did you recognize it? Zombie Field Guide →

04 · Make a Minefield count

When Minefield is available, choose a perimeter socket with a reason: the approach under pressure, the route you expect enemies to take, or a vulnerable defense. Watch what actually happens. Minefield guide →

05 · Follow the ability

Choose a revealed ability card and find its named tower tier on the board. During the wave, watch the effect. After a merge, check which towers still match the card. Ability Cards →

Keep a fortress notebook

Record three things: what I expected, what happened, what I will try next. There is no single solution to these prompts. Revisit one after you meet a new enemy or discover a new defense.

More experiments will be added as the guide grows. Start Here →

Development guide · Updated October 8, 2026. Describes the current development build. Availability and balance may change before release.