Free slots have served as a good source of encouragement for new gamblers who could use some preparatory practice before going into real online gambling. There is an endless collection of free slot machines online accessible through registration on the casino portals. They are of two kinds, download and no download. The former can be played directly through log in, and others have to be downloaded in the system. Some highly recommended free slot machines online are Cleopatra, Ring of Fire XL, Mayan Moons and Simsalabim.