There are quite a few pyramid slots out there. The Pyramid Slot has become one of the most popular for the great game play and bonus round where really big prizes can be won.
There is also Pyramid of The Kings, which is shown below, which is not found in all the casinos, but is also very popular. Very much like Cleopatra slots, pyramid games have all the charm of ancient Egypt.
For online players in the UK (but not the USA or Canada), there is an online version of the game made by IGT. This has a fantastic bonus game.
The bonus game in 50,000 Pyramid allows you to accumulate free spins. You start off with two free spins and a bonus multiplier of 1x. You then pick any tile on on the bottom row of the 50,000 pyramid which may contain free spins, an extra pick, a multiplier booster or an advance pick that takes you up to the next level.