The basic recipe here is that slot machines have a number of symbols on each reel. These are randomly shuffled around so that when the reels stop spinning, the screen shows a mix of symbols. If the final symbols match and are aligned on active paylines, starting from left to right, you receive a payout.

Highest RTP slots online

1
Monopoly Big Event  (99% RTP) ...
2
Mega Joker  (99% RTP) ...
3
Blood Suckers  (98% RTP) ...
4
Rainbow Riches  (98% RTP) ...
5
Double Diamond  (98% RTP) ...
6
Starmania  (97.87% RTP) ...
7
White Rabbit Megaways  (97.77% RTP) ...
8
Medusa Megaways  (97.63% RTP)