Tower Defense Simulator, made by Paradoxum Games, is a co-op tower defense game where you place units on a map to stop waves of zombies and take down powerful bosses. This guide covers how to get started, build a solid lineup, push through tougher waves, and set long-term goals — whether you are playing solo or with friends.
Before you place a single unit, there are two quick things worth doing. Joining the Paradoxum Games group gives you an extra $100 in starting cash, which is free money toward your first towers. The tutorial then walks you through placing units and surviving your first waves, so you understand how everything fits together before the difficulty climbs.
Your lineup needs three things working together: a way to earn cash faster, towers that deal damage, and towers that make your damage dealers stronger. Farm costs 2,000 coins and has no attack, but it boosts your cash income so you can afford stronger towers earlier. Commander costs 4,000 coins and speeds up the attack rate of nearby towers, making it one of the most important purchases you can make. DJ Booth, at 5,000 coins, buffs the towers around it and improves upgrade efficiency, though you can only place one per match.
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Two enemy types regularly catch players off guard mid-run. Hidden enemies move without being targetable by most towers unless a unit in your lineup has Hidden Detection. Lead enemies resist standard attacks entirely unless you have Lead Detection covered. Check your tower list before a run and make sure at least one unit handles each type — discovering the gap during a boss wave is too late.
If a wave keeps breaking through, go through this list before you retry. Most failures come down to a missing role in the lineup, skipped upgrades, or a boss that your towers simply are not leveled enough to handle. In co-op, dividing roles — one player handling economy, another focusing on high-damage towers — makes runs much more stable than everyone building the same thing.
Events bring limited-time maps with their own wave structures and exclusive rewards. Solar Requiem is divided into Night I, Night II, and Night III, and each night has both Easy and Hard difficulty. After an event ends, its exclusive maps and towers are no longer available, so play while it is active.
Beyond surviving waves, the game tracks specific boss kills as achievements. These run from named enemies like the Soul Stealer and Vindicator up through harder targets like the Void Keeper and Void Brute. Clearing Hardcore is a significant milestone, but the game pushes further — Voidcore is the hardest mode and the one the Triumph Voidcore badge asks you to complete.
Once your basic lineup is stable, start saving toward stronger units. Each one below has a different entry cost and level requirement, so pick a target that matches where you are in the game. Coin-only units are the most accessible; Gem units take longer but do not require Robux.
| Farm | 2,000 coins, no level gate, pure income tower with no attack |
| Commander | 4,000 coins, buffs attack speed of nearby towers |
| DJ Booth | 5,000 coins, one per match, buffs and improves upgrade efficiency for surrounding towers |
| Brawler | 1,250 Gems, gains Pierce at level 3 to hit multiple enemies per shot |
| Accelerator | 2,500 Gems, level 50 required, high damage output suited to experienced players |
| Engineer | 4,500 Gems, level 60 required, attacks on its own and also places a Sentry for extra coverage |
| Gatling Gun | 35,000 coins, level 175 required, player-controlled and usable on both Ground and Cliff |
The game has working redeem codes that give free rewards. You enter them using the code box in the top-right corner of the lobby screen — look for the icon marked ABX. Each code works once per account, and expired codes return an error rather than a reward.
2MILLION
Mercenary Pursuit skin
1MILCOMMUNITY
Community Shotgunner skin. You must have the Shotgunner Tower to claim this code
Yes — Farm, Commander, DJ Booth, and even Gatling Gun are all available for coins alone. Gem and Robux units are stronger, but the game does not lock progress behind them.
Farm at 2,000 coins and Commander at 4,000 coins are strong early purchases. Farm grows your income for the rest of the match, and Commander's attack-speed boost makes every damage tower you already have hit harder.
Upgrade your highest-damage towers as far as possible before the boss wave arrives, and confirm that your lineup has Hidden Detection and Lead Detection covered. Bringing extra players into co-op lets everyone focus damage faster and dramatically increases your chances.
From the lobby you can invite friends directly or join a friend's session that is already running.
Gatling Gun is a player-controlled tower that works on both Ground and Cliff zones. Unlocking it requires reaching player level 175 and spending 35,000 coins.
Triumphing in Voidcore mode is the ultimate challenge — the game itself describes it as overcoming the strongest of armies. Clear Hardcore first before attempting Voidcore.
Solar Requiem is a limited-time event split into three nights, each playable on Easy or Hard difficulty. Completing each night and difficulty earns its own badge, so there are six badges in total to collect while the event is active.
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