Chempuz vs HydrogenGame
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Chempuz
Learn organic chemistry basics by creating molecules and completing puzzles. Trace functional groups to build compounds, score higher with complex structures, and use flashcards to memorize names. Enjoy learning through engaging gameplay.
- Create organic molecules by tracing functional groups
- Build approximately 100 types of organic molecules
- Score higher with more complex compound creation
- Collect discovered compounds
- Memorize molecule names with flashcards
- Learn organic chemistry through gameplay
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"Organic Chemistry Puzzle" to learn the basics of organic chemistry You can create compounds freely by tracing functional groups on the screen. You can create about 100 kinds of organic molecules. The score is high when you create complicated compounds. The collection shows compounds found. You can memorize the names of organic molecules with organic chemistry flashcards in Practice. You will learn organi chemistry while enjoying this game.
HydrogenGame
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【Created by someone who doesn't understand chemistry】 It's okay if you don't understand chemistry or the periodic table! Maybe you can learn while playing? 【Features】 -The rules are the same as that watermelon game. But it's a different playing experience. Because the stage is circular, the elements move all the time. - 4 difficulty levels and 3 game modes. Even for people who are good at games, it is quite difficult to score 5000 points on the highest difficulty level. -You can naturally learn the names of elements while playing. Hydrogen → Helium →……. 【Overview】 "Hydrogen Game" is a puzzle game where you aim to get a high score by dropping 118 types of elements from the periodic table. Players can drop elements. When attached to the same type of element, it changes to the next type of element. If the elements fly out of the circle and hit the wall, the game is over. Elements can be purchased by consuming energy. Use it when it's dangerous. This is a game that uses elements and the periodic table, but even those who don't understand the periodic table can have an explanation during the game, so they can play while understanding the rules. [4 difficulty levels] There are four levels of difficulty: "Easy," "Normal," "Difficult," and "Very Difficult." The higher the difficulty level, the more types of elements will appear. First of all, let's learn the rules of the game with "easy". [3 game modes] Normal mode: You can play with basic rules. Let's start playing with this mode. When you combine elements of the same type, they change into the next type of element. Period + Tribe Mode: This mode has “tribe” rules added to the normal mode. Once you get used to normal mode, try it out. When elements from the same type or family group are combined, they change into the next type of element. Tribe only mode: A mode with only the rules of the tribe. We recommend playing the other two modes before choosing this mode. When you put elements of the same type together, they change to the next element in the same group. 【The goal】 ・Achieve a score of 5000 points. ・Extinguish the 118th element. The game is cleared when you complete the goal in all modes and on all difficulties.
Screenshots
Verdict
The clearest difference is price: Chempuz at Free against HydrogenGame's $2.99. HydrogenGame's advantage is in-app purchases (none vs 2) 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
Chempuz is free to download; HydrogenGame costs $2.99 up front. Chempuz sells 2 one-off in-app purchases. HydrogenGame asks for nothing beyond the download.
Chempuz ships an update every 5 weeks, HydrogenGame weekly. The most recent releases landed on October 9, 2026 and October 5, 2026 respectively.
| Parameter | Chempuz | HydrogenGame |
|---|---|---|
| Price | Free — better | $2.99 |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Every 5 weeks | Weekly — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 57 MB | 89 MB |
| Age rating | 4+ | 4+ |
| Developer | TomatoAppLab | Akihiro Kakoi |
In-app purchases
Chempuz
- 1 gem$0.29
- 10 gems$1.99
HydrogenGame
No in-app purchases








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