The first is to collect blocks. You can't miss them. Each block adds one marker to the queue. the panel on the right shows the status of the queue. Each marker also has its own addition sound. Blocks are coming faster and faster. Hurry up and be careful, you can only store up to 4.

In the second part, you clear the queue. See the panel on the right and its symbols. The one below will be the first. You are looking at the catcher's position (your position). Its position must match the drop. if the lowest character in the line matches and you press space, you get points. When dropped, the remaining markers in the queue will be moved.

Controls mouse and touch blue button.

If you prefer a keyboard: