Why the Sequel Exists
Not because the original was broken. The original worked exactly as designed and did so for long enough that players learned its rhythm, and a game built on the tension of "one more lane" loses something once the audience knows where the comfortable exit sits. The sequel restores that tension by moving the boundary slightly, adds a difficulty selector to give the choice back to the player, and puts history on screen because it makes the game feel more transparent.
Whether that transparency helps is arguable. A visible run of results makes an operator look confident and simultaneously invites exactly the pattern-hunting that costs players money. Both things are true at once, and the panel is worth using only in the direction that helps: reviewing your own behaviour after the fact.
Version Numbers You Will See
Chicken Roll 2, 2.0, 2.2, 2.9 and similar labels circulate, and they are not a tidy sequence. Some are genuine incremental updates, some are marketing on a mirror site, and a few are invented to make a repackaged copy sound current. The reliable test is behavioural rather than numeric: does the build offer difficulty presets, and is round history on screen? Those two markers separate the sequel from the original far more dependably than any number in a filename.
For the base rules that both builds share, start from the chicken roll game guide. If you want to work out which build is on your phone right now, the latest version notes explain how to read the version string and why rollouts arrive unevenly.