How the Game Works

The Core Loop

Enemies walk a fixed path toward the exit. You spend cash to build towers alongside that path, and upgrade them as waves get harder. Lose too many hearts in a stage and it's back to the drawing board — but cash and tower placement reset per stage, so nothing you learn is wasted.

Cells (Your Energy)

Playing a stage costs one Cell. Cells regenerate over real time, so if you run out, take a break and come back — or watch a rewarded ad to top up sooner. An Offline Pass (earned permanently at stage 100, or bought early from the Supply Shop) removes the Cell requirement entirely.

The Job Board

Wave warnings, boss alerts, giant-enemy call-outs and class hints all land in one pinned notice panel at the top of the screen during a stage — check it before you commit cash to a build, not after.

The 100-Stage Campaign

A finite, hand-tuned campaign — not an infinite treadmill. Along the way:

• Star Gates periodically require a minimum star rating from earlier stages before you can advance, so a rushed run will eventually need to go back and clean up.
• Gauntlet stages arrive every 15 stages and throw a harder, mixed test of everything you've built so far at you in one go.
• Neon Nights hit every 5 stages, taking the same office after dark with a genuine visual and pacing change of pace.
• Stage 100 is a real finale — clear it and you earn a permanent Offline Pass, ads removed for good, and a shareable certificate of survival.

Rebirth & New Game+

Finished the campaign? Rebirth resets your run onto a rising floor of difficulty in exchange for permanent account-wide bonuses, while the veteran tier system tracks how many times you've been through the building. Long-term progression, not a dead end at stage 100.

The Tower Book & Codex

Every tower and enemy you've encountered gets logged automatically — check the Tower Book for build stats and the Codex for full personnel files on everything that's tried to eat your desk. (Or just use the Equipment Locker and Personnel Files pages here — same info, easier to read on a second screen.)

The Story

A consultant named Barry, from Synergy Solutions, arrives around the early stages and is revealed across four acts to be a lot more connected to the infestation than his business card suggests. Twenty story beats run underneath the campaign's repeating workweek — keep playing to see how far it goes.

A Few Tips

• Empty tower blocks can only be placed or removed between waves — mid-wave changes desync enemies from the path preview, so the game locks it down on purpose.
• Check the wave preview's threat class before you build. A maze of pure M1 Canons will struggle hard the moment a Ghost or Armored wave shows up.
• Splitter enemies burst into three weaker copies on death — pop them somewhere your towers can clean up the spread, not right next to the exit.