Comparison

Monocular Enemy vs HydrogenGame

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

Head to head
About

Monocular Enemy

Embark on a retro 2D side-scrolling adventure as a robot fighting to save the world from monsters. Navigate traps, defeat enemies, and overcome bosses to restore peace. This free game offers a complete experience without waiting or billing elements, featuring auto-save functionality.

Highlights
  • 2D side-scrolling gameplay
  • Robot protagonist
  • Monster and boss battles
  • Trap avoidance
  • Auto-save functionality
  • Free to play
Features
Read full description

Monocular enemy is a 2D action game of side scrolling. A robot got up to save the world dominated by monsters. Defeat enemies, avoid traps, defeat the boss and regain peace to the world. This game has no boring waiting time or billing elements. You can play free of charge until the ending. It supports auto save. ■ Operation method Lkey: move left Rkey: move right Akey: Jump ■ Attack method Akey + Akey Pressing Akey while jumping attacks. Falling + Akey Pressing Akey while falling will attack. BGM: Pocket sound depeloper twitter: YUSEI MIYOSHI

About

HydrogenGame

Features
Read full description

【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

Monocular Enemy4 screens
HydrogenGame4 screens

Verdict

The call

The clearest difference is price: Monocular Enemy at Free against HydrogenGame's $2.99. HydrogenGame's advantage is ads (none vs shown) and update cadence (weekly vs every 15 months). On in-app purchases, device support and iOS requirement 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

Monocular Enemy is free to download; HydrogenGame costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Monocular Enemy ships an update every 15 months, HydrogenGame weekly. The most recent releases landed on October 17, 2026 and October 5, 2026 respectively.

Scorecard3 real differences · 7 level
Monocular Enemy versus HydrogenGame: the parameters behind the verdict, then further details
ParameterMonocular EnemyHydrogenGame
PriceFree — better$2.99
Rating4.6 (93 ratings) — better—
Positive reviews83.3% of reviews—
Number of ratings93 — better—
Update frequencyEvery 15 monthsWeekly — better
AdsYesNo — better
In-app purchasesNoNo
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.012.0
Further details — not scored
Size44 MB89 MB
Age rating9+4+
DeveloperYUSEI MIYOSHIAkihiro Kakoi

In-app purchases

None

Monocular Enemy

No in-app purchases

None

HydrogenGame

No in-app purchases

Questions

Is Monocular Enemy free?
Monocular Enemy is free to download, with no in-app purchases.
Is HydrogenGame free?
HydrogenGame costs $2.99, with no in-app purchases.
Do Monocular Enemy or HydrogenGame have ads?
Monocular Enemy shows ads; HydrogenGame does not.
Which is updated more often, Monocular Enemy or HydrogenGame?
Monocular Enemy ships an update every 15 months, and HydrogenGame weekly. Most recently, Monocular Enemy was updated on October 17, 2026 and HydrogenGame on October 5, 2026.

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