Boo! vs STEM Defense
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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.
- Pumpkin painting puzzles
- Masking attributes
- Increasing difficulty
- 42 Halloween levels
- Daily puzzle mode
- Unlockable content
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'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
STEM Defense
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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
Verdict
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
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.
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.
| Parameter | Boo! | STEM Defense |
|---|---|---|
| Price | Free — better | $6.99 |
| Rating | 4.8 (201 ratings) — better | — |
| Positive reviews | 96.1% of reviews | — |
| Number of ratings | 201 — better | — |
| Update frequency | Every 5 months | Every 4 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 20 MB | 412 MB |
| Age rating | 9+ | 9+ |
| Developer | Bart BONTE | Andrea 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
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- 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
Boo!
- no ads$2.49
STEM Defense
No in-app purchases









