The Last Sundown is certainly not a complicated slot. Play n Go have taken the splitting cells mechanic and made it the ONLY event in the base game and central to the entire free spins round too.
To start, ONE pay symbol will be chosen on every spin to be the splitting symbol. Every instance of that symbol will split when the reels stop, increasing the win ways and giving you more chance of scoring payouts.
The wild can split too, but not the scatter.
In this screen shot the split symbol is the uzi for example.
The uzi splitting on reel 1The splitting symbols feature carries over into the free spins round. First, 3 or more medical pack scatters will have to land to trigger. Once into the bonus round you start with 8 free spins and the symbol that split on the triggering spin carries over into the round.
From the start, one symbol is highlighted in the top left of the screen with a number next to it. Once you have collected the required number of the chosen symbol from your spins, it becomes a split symbol too and is highlighted in the column of symbols on the left. Then 4 more free spins are added to your total and another symbol is chosen. Collect enough of that symbol, and the same happens.
Progressively you are turning every symbol in the paytable into a splitter. And the more you turn, the more win ways will appear on each spin until you are playing with 7,776 on every spin.
4 symbols splitting and 17 spins on the boardYou can see 4 symbols unlocked and 17 spins on the board in this screenshot from my test session. Once you’ve played this round a few times it gets easier to follow. Just keep your eyes out for the highlighted symbol and hope you collect enough before you run out of spins, because that is when the round ends!