My ideal slot would be an amalgam of Thunderstruck, Tomb Raider, Harveys, Hitman, a couple RTG games and a B&M game, with the following features:
Scatters
The scatters must be true scatters - that is, none of this left-to-right or right-to-left crap: that defeats the purpose of the scatter.
2 scatters would pay 2x and trigger a respin la RTG to see if you can get additional scatters (thereby triggering some real free spins).
Free Spins
I love the concept of a Mystery Multiplier which changes with each free spin, so -
3 scatters would pay 5x and trigger 15 free spins with mystery multipliers between 3x and 10x
4 scatters would pay 100x and trigger 20 free spins with mystery multipliers between 5x and 15x
5 scatters would pay 500x and trigger 25 free spins with mystery multipliers between 10x and 20x
The free spins must of course be theoretically infinitely retriggerable.
Bonus Round
There should be a bonus round similar to the green laptop bonus in Hitman. Incredibly difficult to get, but when you do it usually pays nicely. It should not be a "pick any 3 objects" type of bonus - it should be presented in such a way that the player won't get angry at themselves for having "picked" the wrong object, and it should not take more than 50-60 seconds tops to complete the bonus round.
Paylines
There should be 9 or 15 paylines.
As Slotster said, no low-end 2-symbol payouts: that takes away from other combinations and bonus rounds which could pay out more.
Also, if you win anything less than 100x your bet, there are to be no extravagant, long, drawn-out annoying win sounds that prevent the player from spinning again until they complete. If you've ever played Avalon or Kathmandu, you know what I'm talking about ("DING DING DING DING DING!" - oh look, I got four 10's - whoopee).
Wild Symbols
A unique feature I got once on a B&M slot was pretty cool - I had a spin where 3 wilds appeared scattered about, and the reels with the wild symbols were held in place while the other reels respun 3 or 4 times, with winnings accumulating with each respin. (This was not the same as the free spin feature, which that game also had.) I have yet to see this feature in any online slot. Some games hold scatters in place and respin, but not wilds.
Other good properties for the wild symbols (some of which are incompatible with each other) include:
- A 2x or higher multiplier when substituting in winning combinations
- Expanding to cover the whole reel when it appears
- Substituting for scatters as well as regular payline symbols
- Each successive wild increases the payout exponentially like 3-reel slots. For example, 1 wild pays 2x; 2 wilds pays 4x; 3 wilds pays 8x, etc.
Payback
The expected return should be between 99% and 99.5%, making it a truly innovative slot.
And if you could have this done by the end of the month, I would appreciate it!