Outlaw Rails: Hold & Win

A Symbol Collector is a powerful special symbol that primarily appears in bonus rounds like 'Hold and Respin'. Its sole function is to 'collect' the values of other cash value symbols (like coins) on the screen and absorb them into its own value. It goes beyond simply adding values, playing the role of consolidating scattered small values into one massive value to exponentially amplify the potential of the bonus round.

Collector Upgrade is a meta-feature that enhances the basic rules or abilities of a 'Collector' symbol that appears in a bonus round to the next level. The core of this feature is not just to add a new symbol, but to change the behavior of the 'Collector' itself, which plays a key role in the game, thereby boosting the potential of the bonus round to an unpredictable level.