TunnelWorm vs Guess Size
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
TunnelWorm
Guide a worm through increasingly challenging obstacles. Test your reflexes and endurance as the speed and difficulty escalate. Aim to survive as long as possible and surpass your personal best score.
- Obstacle avoidance
- Increasing speed and difficulty
- High score tracking
- Simple controls
- Addictive gameplay
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Help your worm to pass obstacles carefully. The further you go, faster and harder will be. How long can your worm live? Can you beat your high score?
Guess Size
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You see a dog next to a gorilla. A wine glass next to a child. One of them is drawn to scale. The other one is up to you. Drag to resize the red silhouette until it looks right, then hit Validate. The real size appears, and you find out just how wrong your brain was. It is called the Mandela Effect for a reason: we remember sizes we have never actually measured. HOW IT WORKS - A blue reference object is drawn to its true scale - Resize the red object by dragging it, pulling its handle, or pinching - Validate to reveal the real size and score up to 100 points - Five rounds per game, 500 points to chase DAILY CHALLENGE Everyone gets the same five objects each day. Compare your score with your friends and find out who actually has an eye for scale. PRACTICE MODE Play as much as you want with random objects from a library of 60: animals, vehicles, buildings, furniture, everyday objects and a few surprises. SHARE YOUR BEST ROUND Every game creates an image of your best guess next to the real size. Save it to your photos and post it wherever you like. No account. No ads. No data collected. Just you against your own sense of scale.
Screenshots
Verdict
The clearest difference is update cadence: Guess Size at every 3 days against TunnelWorm's every 4 months. TunnelWorm's advantage is device support (5 vs 2) and iOS requirement (10.0 vs 26.0). On price, ads and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
TunnelWorm ships an update every 4 months, Guess Size every 3 days. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.
| Parameter | TunnelWorm | Guess Size |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (6 ratings) — better | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 4 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod, Apple TV, Apple Watch — better | iPhone, iPad |
| Requires iOS | 10.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 52 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Marek Sokol | Remi Cassan |
In-app purchases
TunnelWorm
No in-app purchases
Guess Size
No in-app purchases
Questions
Is TunnelWorm free?
Is Guess Size free?
Do TunnelWorm or Guess Size have ads?
Which is updated more often, TunnelWorm or Guess Size?
Other comparisons
