"Mic can't hear you" in robot games

This means the speech recognition engine could not detect any human speech.

If using iPad app, double check you've allowed Microphone access.
If using Chrome, make sure your Microphone is ON. You may test here.

Tips:

1) be closer to Microphone;

2) play the game in a quiet environment;

3) start saying the word AFTER 'Click to say' is pressed, not at the same time;
4) for single character words, it may help to say the word twice.

Here's a demo video: