Comparison

Boo! vs STEM Defense

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

Head to head
About

Boo!

Dip pumpkins in paint and use attributes to mask parts to solve Halloween-themed puzzles. The difficulty increases as you progress through 42 levels, with a daily puzzle mode unlocked upon completion.

Highlights
  • Pumpkin painting puzzles
  • Masking attributes
  • Increasing difficulty
  • 42 Halloween levels
  • Daily puzzle mode
  • Unlockable content
Features
Read full description

'Boo!' is a spooky puzzle game for you! To solve the puzzles you have to dip the pumpkin in the different paints and wear attributes to mask certain parts of the pumpkin. The puzzles start easy but it gets more difficult! Can you make the correct pumpkin in 42 Halloween themed levels? Complete all the levels to unlock the brand new daily puzzle mode. Happy Halloween, @BartBonte

About

STEM Defense

Features
Read full description

About This Game "STEM Defense" immerses yourself in a strategic battle within the human body, where you manipulate pathways and tower placements on a dynamic hexagonal grid. This educational tower defense game teaches players about the immune system through engaging gameplay, focusing on the defense against microscopic invaders. Key Features Path Expansion: Dynamically extend the pathways pathogens travel to strategically shape each level and increase the effectiveness of your defenses. Tower Placement Strategy: Strategic placement of your towers is essential. Elevate your towers to gain damage bonuses, crucial for optimizing defense effectiveness. Mutation-Based Upgrades: Enhance your defenses through epigenetic modifications, providing temporary boosts, and genetic mutations for permanent enhancements. This mirrors real-life biological defense mechanisms. Experience and Genetic Enhancements: Gain experience to unlock advanced defensive capabilities and permanent genetic upgrades, enhancing your ability to combat pathogens. Varied Enemy Types: Encounter diverse pathogens, each with unique abilities. Develop strategies to handle enemies that can regenerate, accelerate, or spawn additional threats. Endless Replayability: With a multitude of genetic enhancements and adaptive enemy tactics, each game offers new challenges and decisions, ensuring unique experiences with every playthrough. Coming Soon:Acquired immunity mechanics!! Support Independent Development As a solo developer not well-versed in the art of social media, I rely on the support of players like you. If you've enjoyed "STEM Defense," please help spread the word and make it known to others!

Screenshots

Boo!4 screens
STEM Defense4 screens

Verdict

The call

The clearest difference is price: Boo! at Free against STEM Defense's $6.99. Boo! also leads on iOS requirement (12.0 vs 15.0). STEM Defense's advantage is in-app purchases (none vs 1) and ads (none vs shown). On 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

Boo! is free to download; STEM Defense costs $6.99 up front. Boo! sells 1 one-off in-app purchase. STEM Defense asks for nothing beyond the download.

UpkeepUpdate frequency

Boo! ships an update every 5 months, STEM Defense every 4 days. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

Scorecard5 real differences · 5 level
Boo! versus STEM Defense: the parameters behind the verdict, then further details
ParameterBoo!STEM Defense
PriceFree — better$6.99
Rating4.8 (201 ratings) — better—
Positive reviews96.1% of reviews—
Number of ratings201 — better—
Update frequencyEvery 5 monthsEvery 4 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS12.0 — better15.0
Further details — not scored
Size20 MB412 MB
Age rating9+9+
DeveloperBart BONTEAndrea Carlomaria Sertorio

Bugs and requests

Boo!

Reported bugs

5 issues
  • Level 24 progression bug - puzzle completes but won't advance
  • App freezes at logo on iOS 14.7.1
  • Game occasionally freezes after level completion
  • Purchase restoration not working properly
  • Color differentiation issue between white and neon yellow

Requested features

13 requests
  • More levels (most frequently requested)
  • Increased difficulty options
  • Endless or infinite mode
  • Speed run mode with timing
  • Hardcore mode
Show 8 more
  • Additional pumpkin variations and cosmetics
  • New accessory items (cloaks, hats, etc.)
  • Dark theme option
  • Colorblind mode with alternative color palettes
  • Randomized level generation
  • Landscape orientation support
  • Persistent game state when switching apps
  • Notification system for daily puzzles

STEM Defense

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Boo!

One-time1
  • no ads$2.49
None

STEM Defense

No in-app purchases

Questions

Is Boo! free?
Boo! is free to download, with in-app purchases available.
Is STEM Defense free?
STEM Defense costs $6.99, with no in-app purchases.
Do Boo! or STEM Defense have ads?
Boo! shows ads; STEM Defense does not.
Which is updated more often, Boo! or STEM Defense?
Boo! ships an update every 5 months, and STEM Defense every 4 days. Most recently, Boo! was updated on October 26, 2026 and STEM Defense on October 27, 2026.

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