Slider ticks are small dots (ticks) that appear inside sliders. The amount of slider ticks used in a slider is dependent on the slider velocity, BPM and the inherited timing.
During a play, slider ticks are collected by keeping the cursor within said slider's follow circle, that, once collected, will increase the combo by one unit per slider tick collected. If a player fails to collect all the slider ticks in a slider, they will receive a 100 and break their combo.