Features
You can do different manipulation with zone. You can choose how many steps wil be in zone and do we need startup zone on GameStart or not. You can setup Start and End circles of zone on Scene by draging circle prefab or duplicate it and setup radius and position. One from Start|End circles will be choose randomly on Game Start or on Editor Button press. You can pre-setup circles of zone by Editor Button or setup they on Game Start and setup all individual parameters of each circle (start delay, shrinking time, radius, position). Manipulate with Circles size curve and setup all needed events.