As far as symbols are concerned, Alchemy Games have given the classic retro icons an electrifying make-over. The lower-value playing card symbols (10, J, Q, K, A) crackle with energy, while the higher-value cherries, bell, BAR, Lucky 7 and diamonds look positively shocking to the touch. These dynamic icons are complemented by X Up scatters landing on reels 2, 3 and 4 (or 2 and 4 in free spins), and wilds that substitute for low and high pays. In Bolt X Up, wilds also expand to fill the reel. The electricity theme comes through very strongly as the symbols form crackling combinations, and the synth soundtrack thunders with raw power, making for a thoroughly satisfying slots experience.