Mark the words > mark the letters

Hi, I like the ''mark the words'' activities but I would like to be able to mark the letters also. For example, I want to ask my students to click on the letters that are not pronunced in a words.  Or we could also ask them to find the mistakes in a text, and that could be a part of word and not an entire word ...

Mark the words > mark the letters
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BV52's picture

Good suggestion I think this can be a simple but helpful teaching tool.