Comparison

Mysterious Creatures vs 石臼

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

Head to head
About

Mysterious Creatures

Engage in a unique seek-and-find experience by sifting through virtual shirasu to discover hidden sea creatures. Collect a variety of miniature marine life, from baby shrimp to tiny squid, and build your personal collection of these elusive finds.

Highlights
  • Sift through virtual shirasu
  • Discover hidden sea creatures
  • Collect miniature marine life
  • Build a personal collection
  • Hint system for assistance
  • Save game progress
Features
Read full description

Find the mysterious sea creatures lurking in the shirasu! What's shirasu, you ask? Shirasu, also known as whitebait in English, are the small young of fish like sardines and anchovies. They are very small and are used as a garnish or topping in many Japanese dishes, most commonly found as a simple topping for rice. Shirasu are caught in large batches and have an opalescent white color and resemble super tiny fish! They are cooked and salted lightly after being caught. Their close culinary cousin are chirimen, which are baby sardines that have been fully dried. Shirasu, on the other hand, are only partially dried, and have a softer consistency. They're a delicious and simple way to spice up a plain bowl of rice and an everyday part of cuisine in Japan. But... there's more to them than meets the eye! Because the small fish are caught in large batches, occasionally another miniature deepsea creature gets mixed into the shirasu. They're harmless, but you can sometimes find a mini squid, baby shrimp, or tiny fish in the mix! Of course, some are more rare than others, but this kind of seek-and-find suspense has caught on big with children and adults alike. Think of it as the deep-sea version of breakfast cereal... This game simulates the experience of sifting through the shirasu to find mysterious little beasts. See if you can collect them all! How to Play - Using your fingers, sift through the shirasu and look for mysterious creatures. Tap one to add it to your collection. - Pressing the pause button at top right will allow you to look through your collection. - Pressing the Twitter button will allow you to tweet the number of samples you've caught of the selected specimen. - Pressing the magnifying glass at top left will display a hint. Hints are replenished after 10 minutes. - The game is saved each time the pause button is pressed. ※The creatures in the game have been stylized for uniformity, so their color and shape may differ from the real thing.

About

石臼

Features
Read full description

石臼をゴリゴリまわしてみませんか? いろんな材料をゴリゴリ挽いて、ストレス解消しましょう。 ●石臼から出てくる粉 石臼を一周まわすたびに、粉が生成されます。 粉は動くバーに乗るとゴールドになります。 ゴールドをためて石臼を強化しましょう! ●石臼の強化 石臼は強化することで生産性をアップすることができます。 粉ひとつあたりのゴールド換算率の向上や 一周まわすごとに生成される粉の量のアップ、 動くバーの大きくすることもできます。 ●粉にする材料 粉にする材料はたくさんあります。 ゴールドが一定値に達する度にそれらは開放されます。 小麦粉、コーヒー豆、大豆 etc...

Screenshots

Mysterious Creatures4 screens
石臼3 screens

Verdict

The call

The clearest difference is update cadence: 石臼 at every 5 weeks against Mysterious Creatures's every 4 months. On price, ads, 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

Mysterious Creatures ships an update every 4 months, 石臼 every 5 weeks. The most recent releases landed on September 11, 2026 and August 19, 2026 respectively.

Scorecard1 real difference · 9 level
Mysterious Creatures versus 石臼: the parameters behind the verdict, then further details
ParameterMysterious Creatures石臼
PriceFreeFree
Rating3.4 (5 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings5 — better—
Update frequencyEvery 4 monthsEvery 5 weeks — better
AdsYesYes
In-app purchasesNoNo
MonetizationAd-supported—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size13 MB124 MB
Age rating4+4+
DeveloperMasakazu YoneharaHirokazu Oshimo

In-app purchases

None

Mysterious Creatures

No in-app purchases

None

石臼

No in-app purchases

Questions

Is Mysterious Creatures free?
Mysterious Creatures is free to download, with no in-app purchases.
Is 石臼 free?
石臼 is free to download, with no in-app purchases.
Do Mysterious Creatures or 石臼 have ads?
Both Mysterious Creatures and 石臼 show ads.
Which is updated more often, Mysterious Creatures or 石臼?
Mysterious Creatures ships an update every 4 months, and 石臼 every 5 weeks. Most recently, Mysterious Creatures was updated on September 11, 2026 and 石臼 on August 19, 2026.

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