# Opdoku = Calcudoku + Mathdoku — user reviews

> 9 indexed App Store user reviews of Opdoku = Calcudoku + Mathdoku by Christian Rusche, rated 4.20/5 from 10 ratings.

- Source: https://appshunter.io/ios/app/opdoku-calcudoku-plus-mathdoku/id1157986223/reviews
- App overview in markdown: https://appshunter.io/ios/app/opdoku-calcudoku-plus-mathdoku/id1157986223.md
- Rating breakdown: 5★ 7 · 4★ 1 · 3★ 0 · 2★ 1 · 1★ 1

## Most critical reviews (9 lowest-rated)

### 2/5 — Missing Features

*2023-02-13, version 5.1*

I love the variety of modes in this game. I would like to have a way to mark possibilities on each tile as opposed to only one number. I also want to be able to highlight all numbers on the board of a specific value to make it easier to see what to do next. This will be especially useful for harder puzzles. I am willing to pay a one time price for these additional features.
Edited: There has not been any updates since the developer's response.

**Developer response:** Update: With the new version 6.0, you can now not only mark the possible combinations per group, but also those per digit.

### 2/5 — Confusing

*2022-07-12*

The settings are confusing

**Developer response:** With the latest version, I have tried to optimize the start screen and also made help information directly accessible from there.

### 2/5 — No note capability

*2021-01-26*

Game does not let you make notes of possible entries in the cell or let you check for errors. Game is ok for small grids but when you get into larger ones it is necessary to have notes.

**Developer response:** With the new version 6.0, you can now not only mark the possible combinations per group, but also those per digit.

### 4/5 — Challenging

*2025-01-28*

I love the variety of modes in this game. The UI is clean, easy, and fast to use. I like to play some of the hardest modes. It forced me to think outside the box.

Old request: I would like to have a way to mark possibilities on each tile as opposed to only one number. EDITED: They were nice enough to add this feature, yay!

Ongoing request: I also want to be able to momentarily highlight all numbers of a specific value on the board (both big and small numbers) to make it easier to see what to do next. This will be especially useful for harder puzzles.

**Developer response:** Update: With the new version 6.0, you can now not only mark the possible combinations per group, but also those per digit.

### 4/5 — Great but for one small thing

*2018-10-22*

Sometimes it restarts losing your current score

**Developer response:** Thanks for the feedback: I have improved the save function in the latest version. Hopefully this won't happen anymore!

### 5/5 — Challenging, fun, no ads

*2025-11-25*

Love it, but I can't figure out how to turn the possible numbers on.

**Developer response:** Thank you for your feeback! and please press „Show“ on the bottom left to see the possible numbers. Or contact me by using „Feedback“ on the main screen and I will help you.

### 5/5 — Best Kenken app I’ve found.

*2022-10-22*

There are no advertisements, they’re not hounding you for money, and the implementation of the puzzles is great. It’s a breath of fresh air.

**Developer response:** Thank you very much!

### 5/5 — Good game

*2021-08-04*

Very fun.

**Developer response:** Thank you for your feedback!

### 5/5 — Amazing

*2021-01-16*

Amazing.

**Developer response:** Thank you for your motivating feedback!

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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 2026-06-05.*