We strongly recommend using the latest version of Google Chrome or Safari browser to make the sound function properly.
Unfortunately, the Mozilla Firefox browser does not support the sound option on our website yet.
You can view full technical requirements of Happy Numbers here.
To tackle the sound issue, we recommend the following:
Clean cookies on a device you used Happy Numbers
Try to connect to a different internet network (if you sit from a smartphone or tablet, turn off the wi-fi and connect to LTE)
Try to solve a couple of exercises without clicking the microphone button.
Check that your headphones are not plugged in, and you have sound on other webpages
Plug the headphones into your device as sometimes it helps.
Should the issue persist, feel free to contact our support team at
email@example.com or via live chat.