Comparison

Grid Guardians vs Train Invasion

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Grid Guardians

Engage in strategic turn-based tower defense by merging turrets to combat a robot invasion. Plan your moves without time pressure and unleash powerful attacks. Explore numerous levels, face challenging bosses, and master different robot types.

Highlights
  • Turn-based gameplay with no timers
  • Merge turrets to upgrade their power
  • Defeat 10 different robot types
  • Face 5 unique robot bosses
  • Daily challenges and endless mode
  • Offline play supported
Features
Read full description

Merge turrets, plan every move and stop the robot invasion. Grid Guardians is a turn-based tower defense game with no timers: take as long as you like, then press END TURN and watch your turrets open fire. NEW IN 1.6.1 - 20 new levels: chapters 4 and 5, The Foundry and Zero Hour - Every turret rebuilt, all the way up to the 4096 beam - Three new robots: Splitters, Jammers and Burrowers - Tap any robot to see what it does and how to beat it 50 LEVELS, 5 ROBOT BOSSES - Five chapters: Boot Camp, Iron Wall, Overdrive, The Foundry and Zero Hour - A boss ends every chapter, up to the Hydra, which splits in two, and the Overlord - Earn up to 3 stars on every level and open star chests as you go - Later chapters add overcharge pads and anvils, and goals to forge a big turret or win against the clock - Get 3 stars on a whole chapter to open Hard mode MERGE YOUR WAY UP Tap a turret and the board shows where it can go: amber to place, green to merge, blue to swap. Merge two of the same to climb from gatlings to rockets, flamethrowers, twin cannons and beams, all the way to 4096. 10 KINDS OF ROBOTS Runners cross two cells a turn, Shields stop your volley, Medics repair their friends, Drifters switch lanes, Splitters break in two, Jammers weaken your fire and Burrowers dig in. THE DAILY CHALLENGE A new level every day, the same for every player. Win a booster for every star, and every 7th day of a streak pays double. BOOSTERS FOR TIGHT SPOTS Call down a Firestorm, Freeze the robots in their tracks or give every turret a Double Attack. ENDLESS MODE Every turn you survive is a point. Open a chest at turns 100, 200 and 300, beat your best and climb the Game Center leaderboard. ALSO - Play offline, no Wi-Fi needed - Daily rewards and goals that pay out boosters - Sign in with Apple to keep your progress on a new phone (optional) How long can you hold the line?

About

Train Invasion

Defend a runaway train from relentless zombie hordes in this action-packed defense game. Upgrade your character with powerful perks and unique builds to survive increasingly challenging waves and deadly boss battles. Every run offers a new roguelite experience with stylized visuals and immersive gameplay.

Highlights
  • Dynamic zombie wave battles
  • Perk-based upgrade system
  • Roguelite progression
  • Stylized visuals
  • Train defense gameplay
  • Boss battles
Features
Read full description

Train Invasion – Defend. Upgrade. Survive. All aboard… the apocalypse has arrived. In Train Invasion, you are the last hope for a runaway train hurtling through a world overrun by zombies. Intense combat zones, mysterious lucky rooms, deadly boss battles, and more. Survive relentless zombie waves Equip your character, fight off hordes, and protect the train at all costs. Lose the train, and it’s game over. Activate powerful perks Level up and unlock perks of different rarities. Combine them to create unstoppable builds and crush the undead with style. Key Features Dynamic zombie wave battles Perk-based upgrade system with rarity tiers Roguelite progression – every run counts Stylized visuals and immersive train defense gameplay Ready to protect the last train on Earth? Jump in now!

Screenshots

Grid Guardians4 screens
Train Invasion4 screens

Verdict

The call

The clearest difference is rating: Grid Guardians at 3.7 against Train Invasion's 3.0. Grid Guardians also leads on ads (none vs shown) and update cadence (weekly vs every 2 months). Train Invasion's advantage is in-app purchases (none vs 10) and iOS requirement (13.0 vs 16.0). On price, ratings volume and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Grid Guardians sells 10 one-off in-app purchases. Train Invasion asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Grid Guardians holds the better App Store score, 3.7 against 3.0. Both are backed by a comparable volume of ratings — 7 and 5 respectively. Written reviews point the same way: 54% of Grid Guardians's written reviews are positive against 25% of Train Invasion's.

UpkeepUpdate frequency

Grid Guardians ships an update weekly, Train Invasion every 2 months. Both last shipped on November 5, 2026.

Scorecard7 real differences · 3 level
Grid Guardians versus Train Invasion: the parameters behind the verdict, then further details
ParameterGrid GuardiansTrain Invasion
PriceFreeFree
Rating3.7 (7 ratings) — better3.0 (5 ratings)
Positive reviews53.8% of reviews — better25.0% of reviews
Number of ratings7 — better5
Update frequencyWeekly — betterEvery 2 months
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.013.0 — better
Further details — not scored
Size203 MB201 MB
Age rating4+4+
DeveloperSUITE DYNAMIX LLCKiwert

Customer experience

Grid Guardians

All ratings7 ratings
Positive71.4%
Neutral0.0%
Negative28.6%
Written reviews13 reviews
Positive53.8%
Neutral15.4%
Negative30.8%

Train Invasion

All ratings2 ratings
Positive50.0%
Neutral50.0%
Negative0.0%
Written reviews4 reviews
Positive25.0%
Neutral50.0%
Negative25.0%

In-app purchases

10 purchases

Grid Guardians

One-time10
  • revives small$0.99
  • Hearts Refill$1.99
  • Special offer 3$1.99
Show 7 more
  • Starter Pack$2.99
  • no ads$3.99
  • Hearts Infinite$3.99
  • Special offer 2$4.99
  • Hero Pack$5.99
  • Mega Pack$9.99
  • Special offer 1$9.99
None

Train Invasion

No in-app purchases

Questions

Is Grid Guardians free?
Grid Guardians is free to download, with in-app purchases available.
Is Train Invasion free?
Train Invasion is free to download, with no in-app purchases.
Which has better reviews, Grid Guardians or Train Invasion?
Grid Guardians is rated higher. Grid Guardians averages 3.7 out of 5 from 7 ratings, while Train Invasion averages 3.0 from 5 ratings.
Do Grid Guardians or Train Invasion have ads?
Train Invasion shows ads; Grid Guardians does not.
Which is updated more often, Grid Guardians or Train Invasion?
Grid Guardians ships an update weekly, and Train Invasion every 2 months. Most recently, Grid Guardians was updated on November 5, 2026 and Train Invasion on November 5, 2026.

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