# Extreme Difficult Sudoku 2500 — Heat Your Brain! > Challenging Sudoku puzzles across five categories, 2500 total, free to play. (iPhone/iPad app by Ohte, Inc..) - Source: https://appshunter.io/ios/app/extreme-difficult-sudoku-2500/id946797967 (this page in markdown: same URL + `.md`) - Developer: [Ohte, Inc.](https://appshunter.io/developer/905170041) - Category: Games, Education, Board, Puzzle - Price: Free - Rating: 4.50/5 from 107 App Store ratings · 61 written reviews indexed - Age rating: 4+ - Requires: iOS 12.0 · 33 MB - Languages: American English, Japanese, Chinese (Simplified, China) - Released: 2014-12-09 - Data updated: 2026-09-08 - Monetization: free with ads - User reviews in markdown: https://appshunter.io/ios/app/extreme-difficult-sudoku-2500/id946797967/reviews.md ## What is Extreme Difficult Sudoku 2500? For those of you who aren't satisfied with regular sudoku, we've put together a seriously perplexing puzzle collection! There are five categories to choose from—Normal, Cross, Jigsaw, Cross Jigsaw and Inequality—each with 500 puzzles each, for a total of 2500 puzzles! It's totally free to play! If you solve every puzzle, you may be able to become a genius!? ## Key features - 2500 challenging Sudoku puzzles - Five puzzle categories - Normal, Cross, Jigsaw, Cross Jigsaw, Inequality modes - Brain-training gameplay - Free to play ## Recent user reviews (10 of 61) All indexed reviews: https://appshunter.io/ios/app/extreme-difficult-sudoku-2500/id946797967/reviews.md ### 2/5 — Puzzle No.493 Unsolvable *2024-09-11* I like this sudoku app but puzzle No.493 is unsolvable. According to the app I’ve spent over 5 hours trying to solve No.493 and I am quite confident it is simply improperly created. I’ll continue to use this app and will happily change my star rating if the puzzle is ever fixed. ### 2/5 — 星1 *2023-08-19* 難しくない ### 5/5 — I love this so much *2023-08-03* It’s really heat my brain, hahaha. Love it. ### 1/5 — No entry available *2023-03-09* This used to work great. Now I can’t even enter my selection because nothing shows on the screen, not on the right not on the bottom. Has someone tested this. Sorry rhetorical question. ### 5/5 — 紙でやるのに近い *2022-09-04* 他のいくつかの数独もやっていますが、その中では不便さにおいて1番紙でやる数独に近いと思います。 それでも紙と鉛筆消しゴムでやるより数段便利ですけど。 問題に取り組む為にはそつ無く進める必要があります。その場ですぐ間違いを教えてくれません。 間違ったまま最後まで進んでしまってチェックしないで埋まったからできたでしょ、と提出したら5箇所も間違えがw リアル数独。 はじめは操作に慣れず、やり辛いと感じましたが2問もやれば慣れます。 バナー広告は下にずっと出ていますがさほど邪魔にはなりません。一題おわると30秒程広告入ります。 問題も山程用意されています。 紙上の数独を愛する方々におすすめします。 でもNO.302は問題が間違っていませんか？ ### 3/5 — 余り詰め発見 *2022-08-12* 余り詰め発見 ### 1/5 — 非常に操作しにくい *2022-05-12, version 1.2.2* ボタン配置が悪く、操作しにくい。せめて左右を入れ替えたいがそんな機能は無い。3段表示の数字はなぜか電話の並びで、2段表示ではボタンの枠よりもタップで反応する枠が小さすぎてボタンが非常に押しにくい（iPhone11ProMaxで）。更に、元に戻すが故障中なのか元に戻らない。操作ミス連発したら最初からやり直しにせざるを得ないので、パズルが簡単すぎるのにクリア出来ない。 ### 5/5 — 難しくて飽きない‼︎ *2022-04-17* レベル1から結構難しく、飽きないですね。 サクサク解ける数独が物足りないなぁという方、オススメです‼︎ ### 2/5 — 他のナンプレのアプリより *2022-02-01* なぜかものすごく目が疲れます。 自体も見づらいです。 ### 4/5 — No.489 *2021-12-15* 「問題が間違っています」と送信しましたが、当方の勘違いでした。取り消して下さい。 ## Frequently asked questions about Extreme Difficult Sudoku 2500 ### What makes Extreme Difficult Sudoku 2500 challenging? Extreme Difficult Sudoku 2500 features 2500 puzzles across five categories like Normal, Cross, Jigsaw, Cross Jigsaw, and Inequality, designed to be significantly more perplexing than standard Sudoku. ### How many puzzles are available in Extreme Difficult Sudoku 2500? There are a total of 2500 puzzles available, with 500 puzzles in each of the five distinct categories offered by the game. ### Is Extreme Difficult Sudoku 2500 free to play? Yes, Extreme Difficult Sudoku 2500 is completely free to play. However, it does contain advertisements. ### What devices can I play Extreme Difficult Sudoku 2500 on? Extreme Difficult Sudoku 2500 is supported on iPhone, iPad, and iPod devices. ### What is the age rating for Extreme Difficult Sudoku 2500? The game has an age rating of 4+, making it suitable for a wide range of players. ### When was Extreme Difficult Sudoku 2500 last updated? The latest version, 1.3.2, was released on January 10, 2023. ### What is the user rating for Extreme Difficult Sudoku 2500? The game holds a strong rating of 4.4 stars based on 97 ratings. ### Can I play Extreme Difficult Sudoku 2500 offline? While the description doesn't explicitly state offline play, the nature of Sudoku puzzles typically allows for offline gameplay once downloaded. ## Version history (last 5 releases) ### 1.3.2 — 2023-01-10 Bug fixed ### 1.3.1 — 2023-01-07 Bug fixed ### 1.3.0 — 2023-01-04 Bug fixed ### 1.2.2 — 2020-08-05 Bug fixed ### 1.2.1 — 2017-11-06 iPhone X support. ## Apps similar to Extreme Difficult Sudoku 2500 | App | Rating | Price | Category | | --- | --- | --- | --- | | [Jigsaw Sudoku by Logic Wiz](https://appshunter.io/ios/app/jigsaw-sudoku-by-logic-wiz/id6505029709) | 4.9 (59) | Free | Games | | [Sudoku 9](https://appshunter.io/ios/app/sudoku-9/id403191170) | 4.8 (21) | Free | Games | | [Sudoku - Classic Puzzles](https://appshunter.io/ios/app/sudoku-classic-puzzles/id1436156283) | 4.6 (15) | Free | Games | | [Sudoku - classic sudoku](https://appshunter.io/ios/app/sudoku-classic-sudoku/id1630726610) | 4.8 (12) | Free | Games | | [Sudoku: Classic & Variations](https://appshunter.io/ios/app/sudoku-classic-and-variations/id537201666) | 4.8 (1,111) | Free | Games | | [Killer Sudoku - number game](https://appshunter.io/ios/app/killer-sudoku-number-game/id1576305047) | 4.8 (182) | Free | Games | ## More apps by Ohte, Inc. - [ナンプレde懸賞 -【公式】パズルde懸賞シリーズ](https://appshunter.io/ios/app/de-de/id905170038) - [ロジックde懸賞 - 数字を使ったお絵描き・懸賞アプリ](https://appshunter.io/ios/app/de/id1114021307) - [クロスワードde懸賞 - パズルde懸賞シリーズ公式アプリ](https://appshunter.io/ios/app/de-de/id1155919546) - [リンク絵de懸賞 - 絵が浮かび上がるお絵描きパズル](https://appshunter.io/ios/app/de/id1360177449) - [ぬりえで遊んでポイント稼げる - ぬり絵de懸賞](https://appshunter.io/ios/app/de/id1426196155) All apps by Ohte, Inc.: https://appshunter.io/developer/905170041 ## Related topics [extreme sudoku](https://appshunter.io/ios/topics/extreme-sudoku) · [difficult sudoku](https://appshunter.io/ios/topics/difficult-sudoku) · [difficult](https://appshunter.io/ios/topics/difficult) --- *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 2026-09-08.*