Choose to makes your phones screen a particular colour with associated letter.
A - red.
B - green.
C - blue.
D - black.
For use by tertiary educators in conjunction with peer instruction (Mazur) and concept testing
https://andro.io/app/gbclicker
Power 100
Android app profile
Gurthwin Bosman Clicker for Android – Latest Version & Features
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> 2.2k
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~$900
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