Vergence Skill Building. Convergence, Divergence and Jump Duction versions. Protect your base by shooting the rocket that looks different than the other three.
Look at them all carefully before shooting!
To shoot, use the arrows on your keyboard, your touchscreen or if your device has a microphone, say “1,2,3 or 4” to choose the rocket’s position on the screen moving left to right, i.e. say “1” to choose the rocket on the far left. Note: Apple products do not support voice recognition.