Comparison

HydrogenGame vs Duck's Island

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

Head to head
About

HydrogenGame

Features
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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.

About

Duck's Island

Engage in quick, soothing gameplay sessions with adorable ducks. Challenge wild ducks, power up your team, and decorate your island with collected rewards. Enjoy offline play and a unique duck choice system.

Highlights
  • Quick play sessions (< 5 minutes)
  • Soothing duck animations
  • Offline play supported
  • Challenge wild ducks and bosses
  • Duck power-up system
  • Home screen decoration with miniatures
Features
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This game is recommended for people looking for a game like this! - Want to play a little during your free time? ⇒ One play session is less than 5 minutes. - Want to be soothed by cute movements? ⇒ Be soothed by the playful movements of the ducks. - Want to play without worrying about data usage? ⇒ You can play even in airplane mode! Duck's Island - Ducks and wild ducks are different!! - Ducks and wild ducks are the same? I won't accept that! - Challenge the wild duck-inhabited island and defeat the boss! Defeat the final boss to earn rewards. As you challenge higher levels, they get stronger! - Wild ducks are tough. Strengthen your ducks with power-ups! The Duck Choice System always forces you to choose from three options. Your choice is the key to victory! (Don't worry, the weapon is a water gun.) - Add a touch of relaxation to your home screen with miniatures Place the rewards (miniature) you bring home on your island to create a relaxing space. Be soothed by the sight of ducks relaxing on the miniature island. Will you be able to claim the title of Number One Duck?!

Screenshots

HydrogenGame4 screens
Duck's Island4 screens

Verdict

The call

The clearest difference is price: Duck's Island at Free against HydrogenGame's $2.99. HydrogenGame's advantage is in-app purchases (none vs 4) 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

Duck's Island is free to download; HydrogenGame costs $2.99 up front. Duck's Island sells 4 one-off in-app purchases. HydrogenGame asks for nothing beyond the download.

UpkeepUpdate frequency

HydrogenGame ships an update weekly, Duck's Island every 2 months. The most recent releases landed on October 5, 2026 and October 24, 2026 respectively.

Scorecard5 real differences · 5 level
HydrogenGame versus Duck's Island: the parameters behind the verdict, then further details
ParameterHydrogenGameDuck's Island
Price$2.99Free — better
Rating—4.3 (3 ratings) — better
Positive reviews—93.3% of reviews
Number of ratings—3 — better
Update frequencyWeekly — betterEvery 2 months
AdsNo — betterYes
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size89 MB126 MB
Age rating4+4+
DeveloperAkihiro Kakoinew game style

In-app purchases

None

HydrogenGame

No in-app purchases

4 purchases

Duck's Island

One-time4
  • Unlock levels 6 and above$1.99
  • Expand the home$1.99
  • Owned widgets 99$1.99
Show 1 more
  • Four companions$1.99

Questions

Is HydrogenGame free?
HydrogenGame costs $2.99, with no in-app purchases.
Is Duck's Island free?
Duck's Island is free to download, with in-app purchases available.
Do HydrogenGame or Duck's Island have ads?
Duck's Island shows ads; HydrogenGame does not.
Which is updated more often, HydrogenGame or Duck's Island?
HydrogenGame ships an update weekly, and Duck's Island every 2 months. Most recently, HydrogenGame was updated on October 5, 2026 and Duck's Island on October 24, 2026.

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