Comparison

Super Marimo Depth vs Knife Challenge

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

Head to head
About

Super Marimo Depth

Embark on a deep sea adventure to nurture a growing marimo as it descends. Feed it nutritious seaweed, avoid dangerous debris, and challenge yourself to grow it as large and as deep as possible.

Highlights
  • Guide sinking marimo
  • Feed marimo seaweed for growth
  • Avoid underwater debris
  • Compete on marimo size
  • Compete on descent depth
  • Choose control style
Features
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"Super Marimo Depth" is a deep sea adventure game where players help raise marimo as it sinks into the sea - showering it with affection to help it grow and avoiding obstacles as it delves deeper and deeper. When game-play starts, marimo plops into the sea and starts sinking. Let it go and it will go into a free fall, so players have to help marimo avoid debris - bump into anything and it's game over. As you go along, take in the mozuku (a kind of seaweed) that floats about under the sea to help marimo grow. Marimo's main source of nutrition is mozuku, so have the marimo eat a lot of it. Along the way, things resembling brown marimo will appear - these are hairballs. You can knock these down by bumping into them. Breaking open a hairball will unleash a load of mozuku. Take these in to help grow marimo. In this way, you compete over the following: ・How big can you grow the marimo? ・How deep into the sea can you make marimo go? You can choose from the following two control styles, according to your preference: ・Using the touch and slide functions of the screen ・Angling the device back and forth.

About

Knife Challenge

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"Knife Challenge" is a flying knife shooting game, a game that can make you click crazy! In addition to the fun of hitting with a knife, those who love knives can also enjoy the wonderful fun of throwing knives! The gameplay is simple and exciting. In the game, we need to insert the flying knife into the rotating log quickly and quickly. When it is inserted into the specified number, the log can be broken and the next goal is reached. It is time to show the real technology. Start now, come and challenge together to see who is the strongest hand speed! Game features: The operation is simple and interesting, just click to get started Test reaction ability and quick thinking Perfection is 3D visual effects Magical addictive arcade challenge How to play: Aim at the target, click on the screen, hit and destroy the boss one by one, the more you hit, the more knives you can get; Avoid hitting the knife that has been inserted into the log. Don't hesitate, now come to "Knife Challenge" to start your journey as a master thrower!

Screenshots

Super Marimo Depth4 screens
Knife Challenge4 screens

Verdict

The call

The clearest difference is ads: Super Marimo Depth at none against Knife Challenge's shown. Super Marimo Depth also leads on iOS requirement (9.1 vs 11.0). On price, update cadence, in-app purchases and 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Super Marimo Depth ships an update every 6 months, Knife Challenge every 8 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard2 real differences · 8 level
Super Marimo Depth versus Knife Challenge: the parameters behind the verdict, then further details
ParameterSuper Marimo DepthKnife Challenge
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 6 months — betterEvery 8 months
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.1 — better11.0
Further details — not scored
Size124 MB161 MB
Age rating4+4+
DeveloperTakemi Matsumoto北京快博科斯信息技术有限公司

In-app purchases

None

Super Marimo Depth

No in-app purchases

None

Knife Challenge

No in-app purchases

Questions

Is Super Marimo Depth free?
Super Marimo Depth is free to download, with no in-app purchases.
Is Knife Challenge free?
Knife Challenge is free to download, with no in-app purchases.
Do Super Marimo Depth or Knife Challenge have ads?
Knife Challenge shows ads; Super Marimo Depth does not.
Which is updated more often, Super Marimo Depth or Knife Challenge?
Super Marimo Depth ships an update every 6 months, and Knife Challenge every 8 months. Most recently, Super Marimo Depth was updated on November 1, 2026 and Knife Challenge on November 3, 2026.

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