# Sumoscience — A sumo game for 1 or 2 players

> Sumo wrestling physics simulation game with practice, tournaments, and local multiplayer. (iPhone/iPad app by Franklin Chang.)

- Source: https://appshunter.io/ios/app/sumoscience/id1467299921 (this page in markdown: same URL + `.md`)
- Developer: [Franklin Chang](https://appshunter.io/developer/1467299920)
- Category: Games, Sports, Action, Sports
- Price: Free with in-app purchases
- Rating: 4.80/5 from 8 App Store ratings · 15 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 99 MB
- Languages: American English
- Released: 2019-06-15
- Data updated: 2026-08-22
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/sumoscience/id1467299921/reviews.md

## What is Sumoscience?

Sumoscience is a game for people who want to learn more about sumo. It models the physics (forces/collisions) between the wrestlers. You can do a frontal pushout, belt pushout, slapdowns, and throws. You can practice in the practice room or try your skills in a one or two player tournament. In the practice room, you can change the attack style and level of your opponent to practice how to deal with certain attacks. You can also select automatic play to watch the computer play itself. 

In the game, you are the wrestler with the yellow belt. On the right side is a first-person view of your opponent with buttons for various attacks. 
1) Chest attack: Press the red button the push the chest. You need to be moving forward for this to be effective.
2) Slapdown: Drag down the yellow button and your arm will reach for their head and attempt to pull them down. After your arm makes contact with their head (button turns blue), you need to move backward to give more force to your pull. This only works if your opponent is moving forward.
3) Grip Belt: You can press the green buttons to reach for the belt. When you have a grip, the button will turn blue. You can push them out of the ring. If you have a two-hand grip, you can sometimes lift them. You can escape from this grip by turning quickly.
4) Throw: Once you have a grip, you can turn quickly to the side opposite your grip. Once you are facing the same direction, you can step forward to throw them.
5) The forward and back buttons are on the left. The turn button is in the middle of the first-person view and it must be dragged left or right to turn.　

There is a tournament room where you can compete in a tournament and get ranked from low Maegashira to Yokozuna. A tournament consists of 15 matches and you need to win 8 to be promoted. To get promoted to Ozeki, you need 33 wins in the last three matches. To get promoted to Yokozuna, you need to win two consecutive tournaments. When you finish a tournament, your rank will be posted on the leaderboards. There is one for overall high scores and one that is reset each month to provide a monthly tournament. In real world sumo, Yokozuna is an honorary rank and you cannot go down to ozeki (a Yokozuna can only retire). To simulate this, there is a Yokozuna leaderboard where the scores of tournaments by Yokozuna will be posted in terms of recency. To stay at the top of this leaderboard, you must regularly be in tournaments as a Yokozuna, otherwise your name will go down the list and that will be like retirement.

Also, in this room you can change the color of the sumo’s belt. Just click on the belt of either your own wrestler or your opponent, and select the color from the wheel. Then click the belt again to close the selector.

There is also a two-person room where you can play with others over wifi. Just connect to the same wifi. One player should press player 1 and the other player 2. Then both players press play and when they are both done, the sumo wrestlers will bow and the game will start. At the end, player 1 needs to press play to reset the game and then both players need to press play to start the bow.

Sumoscience attempts to mimic some of the difficulties in real sumo. The chest push is easy, but you need to keep your opponent in front of you. Slapdowns are more difficult, because you need to have enough room to move backwards without going out. Gripping the belt and pushing them out is relatively straight-forward, but can be difficult if they are doing the same thing to you. Throws are a powerful move, but they require the coordination of multiple movements. As in real sumo, moving forward and keeping your opponent in front of you are the basis of a good technique.

## Key features

- Realistic sumo physics simulation
- Multiple attack styles (pushout, slapdown, throws)
- Practice room with adjustable AI
- Single and two-player tournament modes
- Rankings and leaderboards
- Local Wi-Fi multiplayer
- Customizable belt colors

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Support this app | $8.99 | one-time |
| Unlock game | $6.99 | one-time |


## Recent user reviews (10 of 15)

All indexed reviews: https://appshunter.io/ios/app/sumoscience/id1467299921/reviews.md

### 3/5 — おもろいんだけど

*2025-10-20*

確かに面白いけど小結のロック解除で1000円とか高いって300円ならまぁギリ買うけど1000円高すぎる

### 2/5 — 相撲好き

*2025-06-04*

小結の行き方を教えてほしいです。

### 5/5 — 今更すいません

*2025-02-23*

携帯でやってるのでスタートメニューの仕方がわからないので小結にいける方法を教えてください。今更ごめんなさい

### 5/5 — Easy to learn, Hard to master

*2024-02-15*

Firstly, let me just say that I love this game. It’s so much fun!
I’ve had it for a year and a half now, I even downloaded it on my GF phone to play. I came across this app because I just started to get into watching grand sumo and had a hankering for a sumo game. This game scratched that itch. Not only did I get to play but I also learned some of the kamarite along the way. 

I usually play when I’m at the airport or on public transit, to pass the time.
Just learning the controls takes a little while to get used to, but once you learn them the game really takes off. 
It took me two tournaments to get the hang of what I was doing.

Very appreciative of the developer for taking the time to make this gem. I’m sure it wasn’t easy getting all those techniques to actually work how he wanted. 

Secondly, I have a pipe dream suggestion, I’m no game developer, so I’m not sure how difficult it would be for you to implement any of these ideas, but I figured I’d ask. 

Have you considered having a career mode, where you can customize your wrestler make them different sizes, the ability to pick our stats in the beginning, make them faster if they are smaller , or a tall and strong belt grabbing extraordinaire, Like our Yokozuna.

The ability to have names, maybe give our opponents random generated names. change the wrestlers skin color, maybe add some distinguishing features like sideburns or bushy eyebrows, so we remember that the bushy eyebrow’d yellow mawashi kicked my butt three tournaments in a row. Next tournament I shall have my revenge. 
Just an idea I had while playing that I thought would make this game more immersive. If it’s impossible for this game, I understand. 
But is there a possibility that  you would consider making A Sumoscience 2 and implement said features. After all you said that Sumoscience was your first baby, so maybe now that you're a polished game developer and have your sumo degree the sequel is your next challenge. lol here’s to dreaming. Again Mr. Chang  thanks for making this game. I’ve enjoyed every second I’ve played.

**Developer response:** I am glad that you enjoyed the game.  Yes, it was a lot of work to get everything working.  And thanks for your suggestions.  I think the idea of making the opponents distinctive might be doable.  Maybe some could be better at throwing, while others would be better at pushing.  And maybe bigger guys might be harder to move, but also slower.  And each tournament, they would return in a slightly different order.    I am pretty busy at the moment, but this idea seems like a good step forward, so I will think about it some more.  Thanks.

### 1/5 — 課金優遇もないのか

*2023-04-04*

返金して欲しいぐらい
作者の顔が見てみたい

### 2/5 — 回しが取れない

*2022-08-17*

緑の回しをとるマークを押しても全然取れません。

**Developer response:** 以前のバージョンでは、緑のボタンを押すだけで投げることができ、攻撃が簡単すぎました。 今回のバージョンでは、投げ技を行うにあたり多くのステップを用意しました。
1) まわしをつかみます (色が青色に変わります)。
2) 左下または右下にある回転矢印をドラッグします。
3) 投げ技を完了するには前に出なければなりません。
また、対戦相手が前進していない場合、対戦相手を投げることはできません。 投げ技の練習をするには、練習室に行き、レベル1で対戦相手に突っ張りをさせてください。また、学習室も見てください。 それでもうまくいかない場合はお知らせください。

### 5/5 — 連勝記録があったら面白いかも？

*2022-01-25*

いつも楽しませて頂いてます。一つ提案なのですが連勝記録があったらより面白くなると思います！

**Developer response:** ご提案ありがとうございます。 次のアップデートで追加します。

### 4/5 — 酷いCPU

*2022-01-20*

何か、叩くだけの奴と投げるだけの力士しか出て来なくなりました。しかも、自分と違ってすぐ回しを掴んでくるし、なんかイヤになります

**Developer response:** CPUは、プレイヤーの技と土俵上の位置に基づいてランダムに技を選択します。 したがって、同じ技をランダムに複数回受けた可能性があります。 次回ゲームを更新するときに確認します。

### 5/5 — The greatest sumo game out there

*2021-11-28*

I don’t know what to say, this game is a must play for genuine sumo fans. It has a lot of realistic techniques, that are Translated mind you, and now with all that improvement that’s been done to it in the last couple of months, now this game has transitioned from being a great sumo game to the best out there, since the last great sumo game was made in 2001 for the PS2, That’s 20 years ago! And it was in Japanese. So having an English sumo game that’s realistic basho and technique wise, is a dream come true. And I have always wondered, is the opponent supposed to be Tochinoshin? Because his yori-Kiri is scary.

**Developer response:** Thanks a lot!  I am really happy that sumo fans like the game.  This was the very first game that I have ever made and it started rough (and is still a bit rough).  But I am happy with the game play now.  When I started, I enjoyed sumo, but I didn't know that much about it, but now I feel like a sumo PhD.   The game gives you a deeper insight into what sumo feels like.  For example getting kachikoshi in a tournament in the game is pretty hard, so you can feel what it is like for the actual wrestlers to fight day after day for it.   The previous version of the game had a bug, so the computer opponent was not doing slapdowns and throws.  Tochinoshi is pretty good with the belt, so I am not sure the computer was so similar.  Now the opponent should be more balanced with slapdowns, belt pushouts, and throws.

### 5/5 — Lovely game.

*2021-10-03*

I lost 30 matches in a row to start off but once I figured out oshi-dashi I was fine lol. (I'm a Takakeisho fan so I guess it comes naturally.) The mechanics are really fun to play around with and I love playing this game so much. I wish I could name my rikishi and I wish the other rikishi were named too, I feel that it would add a subtle layer to the already amazing game you've made. If you see this, thank you.

**Developer response:** I am glad that you like the game.  When you fight in the tournament room, you can create a game center name and compare yourself with others on the leaderboards.  At the present, the wrestlers do not have names and I am not sure about adding that as it would make things really complicated.  I have changed the level 1 in the practice room (version 2.2) to make the opponent less aggressive, so hopefully people can practice there without losing all of the time.

## Frequently asked questions about Sumoscience

### What are the main gameplay mechanics in Sumoscience?

Sumoscience focuses on realistic sumo physics, allowing players to perform frontal pushouts, belt pushouts, slapdowns, and throws. Players control their wrestler using on-screen buttons for attacks and directional controls for movement and turning.

### Can I play Sumoscience offline?

Yes, Sumoscience offers an offline practice room where you can hone your skills against the computer. You can also compete in single-player tournaments without an internet connection.

### Does Sumoscience have multiplayer options?

Sumoscience supports both single-player tournaments and a two-player mode that can be played over local Wi-Fi. This allows you to challenge a friend on the same network.

### How does the tournament system in Sumoscience work?

Tournaments consist of 15 matches, requiring 8 wins for promotion. Achieving higher ranks like Ozeki and Yokozuna involves specific win conditions and consecutive tournament victories, with leaderboards tracking progress.

### What is the age rating for Sumoscience?

Sumoscience is rated 4+ by the developer, making it suitable for a wide range of players interested in its sumo wrestling simulation.

### How often is Sumoscience updated?

The latest version of Sumoscience is 2.4, which was last updated on November 27, 2021. This indicates a release cadence of roughly one to two years between major updates.

### Does Sumoscience have ads?

No, Sumoscience does not contain advertisements. The app is free to download and play without any interruptions from ads.

### What devices is Sumoscience available on?

Sumoscience is compatible with iPhone, iPad, and iPod devices, offering a consistent experience across Apple's mobile ecosystem.

## Version history (last 5 releases)

### 2.4 — 2021-11-27

1) Fixed Belt Color Bug.  In the tournament room you can change the color of the sumo’s belt. Just click on the belt of either your own wrestler or your opponent, and select the color from the wheel. Then click the belt again to close the selector.
2) Fixed Support Button

### 2.3 — 2021-11-14

1) Throwing requires that opponent is moving when you move forward.
2) Opponent is faster.
3) There is a championship leaderboard which records how many tournaments that you have won.
4) Number of winning matches overall is recorded in statistics.
5) Grip on belt does not break as easily.

### 2.2 — 2021-10-11

1) movement is now blocked during bowing
2) grabbing the belt is harder
3) opponent in practice room is less aggressive at level 1.

### 2.1 — 2021-08-13

1) Fixed problems with controls after pausing
2) Fixed problem with opponent not chasing when too far away
3) Added statistics page in tournament room to provide information about performance with different techniques.

### 2 — 2021-08-02

Major Changes
1. Opponent will do slap down and throws more frequently. 
2. It is now easier to grip the belt and opponents will try to use the belt to push you out.
3. Turning is faster, but to do a throw, you need to turn smoothly to avoid breaking your grip (stepping forward needs to be quick).
4. If your opponent is trying to pull you down or throw, you can turn to rebalance yourself.
5. Slapdown is now more likely to succeed.
6. You can see whether your opponent has a grip on your head or your belt.
7. Many bug fixes (e.g., achievements now work properly)

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## More apps by Franklin Chang

- [Dictionedit](https://appshunter.io/ios/app/dictionedit/id1468649670)
- [Jotflash](https://appshunter.io/ios/app/jotflash/id1470827781)
- [Tracecolor](https://appshunter.io/ios/app/tracecolor/id1472203437)
- [Digitspeech](https://appshunter.io/ios/app/digitspeech/id1480608345)
- [SumoscienceAR](https://appshunter.io/ios/app/sumosciencear/id1522142998)

All apps by Franklin Chang: https://appshunter.io/developer/1467299920

## Related topics

[sumotori dreams v1.2](https://appshunter.io/ios/topics/sumotori-dreams-v1-2) · [sumotori dreams](https://appshunter.io/ios/topics/sumotori-dreams) · [sumotori](https://appshunter.io/ios/topics/sumotori)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-22.*