On 3Dice, you can actually see a record of the biggest wins on all their slots - so, for example, the biggest win on Slotro is 1200x bet - and that's over about an eight year timespan; yet Tutankhamun's biggest win list are all more than 3x that - i.e., 3800x bet and up, over the same time frame.
SO, if I was going for a big win, I'd play Tut, Medieval, Starstruck or Arctic - all seem to be some of the very highest variance games. In theory, on Arctic, if you kiss the queen and get 100 spins @ 10x, you could get a VERY high return. The highest return so far has been 4398x bet, but it will be interesting to see how long that record high lasts.
On RTG, I'd play Paydirt, T-Rex, and Mystic Dragon.
I don't think those figures are completely correct, i have seen that list plenty of times, and remember vividly seeing a few bet multipliers of 6000x and up, I also remember Medieval Moolah listed with an insane 12000x bet, and i also think Arctic has already had higher hits then 4398x, but i might recall incorrectly
Maybe those figures get reset every now and then?
Anyway, it is hard to win big on 3dice due to their variance, so if you are indeed high rolling, or higher then most, it can be quite costly...
I am sure you will hit a few big ones there if you keep trying though!
My favourites for say around 3 to 5 bucks a spin, to hit it big, would be:
FortuneFalls (up to 1600x)
Tutanchamon (5000x and higher)
Arctic Adventure (the sky is the limit here
)
Moolah (12000x seems the limit)
On MG i'd stick to the 243 way's and BDBA, or any of the classic 9-liners, and Oriental Fortune (beware!)
And on Netent pretty much DOA and Piggy Riches, and the occasional 10 euro spin on Jackpot6000
I have also discovered some lower volatility slots from a few other providers, that do have the 1000x and up in their paytable, some of them i have played at 40,- a spin, but that is pretty mad..
Those slots are:
Play&Go: Energoonz (or @
Unibet the same slot but their exclusive version of it Trolls)
Ash Gaming: Fairest of Them All
Leander: 7 Lucky Dwarfs
There are more of these types of slots online, the big hit is as rare on any of them, but they are definitely on the paytable
Good luck!