3 Hot Chillies collects coloured pepper symbols into three progress meters above a five-by-three grid. The triggered meter determines the bonus enhancement: Ultra adds multipliers, Extra Spins increases the re-spin allowance, and Double Reels opens a second field with duplicated bonus symbols. All three may combine. The original title should not be assigned the later 3 Super Hot Chillies release's Super Wheel feature.
To compare related slots formats, read the rules of 3 Hot Teapots and 3 Coin Volcanoes.
The library also explains the difference between lines, ways and clusters to help put these mechanics in context.
Source: published game information.
