This is similar to "six stars system" but played with straight up numbers. it's called "I'm eighteen" because 18 numbers are bet, and each hit gives 18u profit.

Look at the history of spins, and for each street hit the two unhit numbers are bet until 18 numbers are bet (9 streets are bet), it's good to have a tracking software (like rx or spinmaster) to see further back in history of spins (it's not a progressive bet, bet starts with 18 numbers!)

same here 6 spins to begin with, then start martingale 1 2 4 8 16 32 64 128... etc (that's 14 spins) depending on the tablelimits and your bankroll

at betvoyager RNG tablelimit for straightups are 100, at Eurogrand RNG it's 150.

again, there is always a risk, but that risk is worth taking imo.

from my first test highest step in progression was 16.