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1. I have to physically bring my phone to my face just to make out the numbers, and I don't even wear glasses! It's honestly quite unacceptable, given how people with actual visual impairments would be affected.I wrote a review a long time ago giving this 4 stars and mentioning some flaws I found with the app (primarily that multiple choice math questions are too easy to "cheat").

2. After something like two years, they've added an $8 full version but seemingly haven't added any features and it's still almost useless to me without an option to not use multiple choice, so I can't really recommend it, especially the paid version.I've only been playing for a few minutes, but it's definitely the best mental math game I've played.

3. I was an absolute math nerd during my school time, but now I noticed that after less then a year of taking a break from everything related to numbers, I can't even do basic multiplication without a high error rate.

4. Is this a legit way to play the game? Maybe in higher levels you get multiple choices with the same last digit.

5. Overall a step above the other apps I've tried (of which there have been many.)Exercise curve is a bit too steep with no way to go back to earlier difficulties, leaving you failing and re-trying the same level that is too hard for you instead of getting more exercise on a less challenging stage before moving on.

6. Practicing with this app while I wait for customers or my train is a fun way to learn and actually makes me feel better about myself and how I spend my time :)I like this game.

7. Other games seem to jump from "not a challenge at all" straight to "impossible," which is not fun or very educational.This is a great app but I would really like if there where separate modes for addition and subtraction, or maybe just the ability to toggle different operations.

8. Aside from that the app runs well and doesn't have any annoying ads.The game is awesome! The brain is a muscle and a game like this is the perfect workout.

9. Only on the second level, but a good game to wake up from a mental fog perhaps.

10. Anyhow, the game is awesome.It's clear that there's a passionate creator behind this app and I do really appreciate that.

11. I'd like to ask the developers, though, if the calculations were meant to be solved completely, because most of the times I cheat my way out by just calculating the last digit and see how it fits with the given possible answers.

1. Fix Mental Math Master Not Working/Crashes/Errors/Unresponsive & Black/White screen:

1. Restart Mental Math Master: Restarting the app will resolve most errors.
2. Update the Mental Math Master App. Here is how:
   1. On Android goto PlayStore » Search for "Mental Math Master" » Open Mental Math Master » click "Update".
   2. On iPhone, goto AppStore » Your profile » Available Updates » Check for Mental Math Master » click "UPDATE".
3. Clear Mental Math Master app cache: Clearing cached data will force your app to retrieve the latest data directly from Mental Math Master servers.
   1. On Android, goto Settings » Apps » Select "Mental Math Master" » click Storage » click "Clear Cache".
4. Check Mental Math Master app permissions. If any of these permissions required to use your device's features are disenabled, Mental Math Master might not work.
5. Uninstall and reinstall Mental Math Master. If nothing else has worked, completely uninstall Mental Math Master then reinstall.
6. Restart your device. Last, restarting your device can often clear most problems causing Mental Math Master not working

2. Fix Mental Math Master Server issues & Internet Connection

1. Check network connection: An unstable Internet will make Mental Math Master be unable to connect to it's servers. Ensure your wi-fi is working then restart app.
2. Disable VPN: VPN can cause connection errors and lead to Mental Math Master not working. Make sure all VPNs are off
3. Enable background data: When Background data is turned off, Mental Math Master may not be able to connect to the Internet when running in the background.