hi, thanks for your question.
The game has 2 separate mechanics. The first is to collect blocks. [left and right arrow] You can't miss them. Each block adds one marker to the queue. Each marker also has its own addition sound. The queue can hold a maximum of 4 markers.
In the second part, you clear the queue. You're looking at the catcher's position. Its position must match the drop [space ket]. if the lowest character in the queue matches, press space and the positions in the queue will be moved.