Since the element symbol / chemical formula is displayed randomly
Swipe (from the middle to the correct answer) if there is a correct element symbol / chemical formula, or tap (middle) if it does not exist.

Please note that it may not be just a four-choice app.

Once the tap / swipe is decided, it will become more and more fun.
⇒ Enter the bonus time with consecutive correct answers.

Aim for a high score in one minute.

I hope it will be of some help to improve brain training, reflexes, and dynamic visual acuity.

Music: Conte De Fees