Comparison

Reverse Reaction! vs HaloStack

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

Head to head
About

Reverse Reaction!

Features
Read full description

Your instincts are WRONG. That's the whole game. Opposite Day! flips everything you know about reaction games. The screen says TAP — so you don't. It says DON'T TAP — so you do. Simple to understand, hilariously hard to actually do. HOW IT WORKS • Read the instruction • Do the EXACT OPPOSITE • Do it fast — hesitate and you lose a heart Tap, hold, and swipe your way through levels that get faster, trickier, and sneakier. Just when you think you've rewired your brain, the game flips the rules again. WHY YOU'LL LOVE IT (AND HATE IT) • One-hand, one-minute rounds — perfect for queues, commutes, and "one more try" spirals • Levels that escalate from "easy" to "how did I fail THAT" • 3 hearts per run — every mistake counts • TODAY'S TRICK — a fresh daily challenge to keep your brain on its toes • Clean, hand-drawn notebook style with zero clutter TRAIN YOUR BRAIN BY BREAKING IT Opposite Day! isn't just about speed — it's about impulse control. Suppressing your first reaction and doing the reverse is a genuine mental workout. You'll feel your brain fighting you. That's the point. Easy to learn. Impossible to master. Infuriatingly fun. Think backwards. React smarter. Play Opposite Day! Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

HaloStack

Features
Read full description

HaloStack: The Ultimate Circular Puzzle Experience a new dimension of block puzzles on a unique circular board! Place colorful blocks on a ringed stage. Whether you prefer the classic wood texture or vibrant modern themes, HaloStack offers a visual treat. Complete rings, straight lines, or diagonals to clear blocks and rack up massive combo scores! ▸ HOW TO PLAY • Pick one of three control schemes—each feels different to play: drag-and-drop placement, on-screen virtual controls, or a quick drag-and-double-tap flow. • Clear blocks by filling a full ring, a straight line, or a diagonal line. • Chain your clears to trigger combos for huge bonus points. • Game over when there's no more space. Challenge your own high score! ▸ FEATURES • Three control methods: drag-and-drop placement, on-screen virtual controls, and drag-and-double-tap play. • Innovative circular grid with 6 concentric rings. • Multi-directional clearing: Rings, Lines, and Diagonals. • Multiple themes and backgrounds, including premium wood styles. • Easy to learn, yet deep enough to challenge your brain. • Personal best scores and play history saved on your device. • Save your game and resume later. • View your game history. • Play offline anytime, anywhere. Ready to conquer the rings? Download HaloStack today!

Screenshots

Reverse Reaction!4 screens
HaloStack4 screens

Verdict

The call

The clearest difference is in-app purchases: HaloStack at none against Reverse Reaction!'s 8. HaloStack also leads on update cadence (every 11 days vs every 5 months). Reverse Reaction!'s advantage is iOS requirement (13.0 vs 15.0). On price, ads 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. Reverse Reaction! sells 8 one-off in-app purchases. HaloStack asks for nothing beyond the download.

UpkeepUpdate frequency

Reverse Reaction! ships an update every 5 months, HaloStack every 11 days. Both last shipped on October 31, 2026.

Scorecard3 real differences · 3 level
Reverse Reaction! versus HaloStack: the parameters behind the verdict, then further details
ParameterReverse Reaction!HaloStack
PriceFreeFree
Update frequencyEvery 5 monthsEvery 11 days — better
AdsYesYes
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size62 MB88 MB
Age rating4+4+
DeveloperPercy Ng'uniCdPlus

In-app purchases

8 purchases

Reverse Reaction!

One-time8
  • Space Theme$0.99
  • Sketch Theme$0.99
  • Deep Sea Theme$0.99
Show 5 more
  • Retro Theme$0.99
  • Remove Ads Forever$1.99
  • 500 Coins$1.99
  • Remove Ads$3.00
  • 1000 Coins$4.99
None

HaloStack

No in-app purchases

Questions

Is Reverse Reaction! free?
Reverse Reaction! is free to download, with in-app purchases available.
Is HaloStack free?
HaloStack is free to download, with no in-app purchases.
Do Reverse Reaction! or HaloStack have ads?
Both Reverse Reaction! and HaloStack show ads.
Which is updated more often, Reverse Reaction! or HaloStack?
Reverse Reaction! ships an update every 5 months, and HaloStack every 11 days. Most recently, Reverse Reaction! was updated on October 31, 2026 and HaloStack on October 31, 2026.

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