Chords

General
The chord is at least two notes at the same moment. Usually, most songs have chords, and that’s how it looks. (Screenshot from Rousseau's video) These are pressed three black notes - all are “#c”. In Piano Tiles 2, they’re: #C-2, #C-1 and #c.

How to make them as chord?
It’s so easy: put notes between brackets, separate them by dots, in this case: (#C-2.#C-1.#c). The order doesn’t matter; we can even put (#c.#C-2.#C-1).