Who Wants to Be a Millionaire by Big Time Gaming is a Megaways slot based on the television quiz show format. The game uses a six-reel structure with variable ways to win, shown by the Megaways counter at the top of the screen. Symbols include classic card icons, gemstones, coins, the Millionaire logo, and Wilds.
The demo version lets players play for free and practice before playing for real money. A separate extra reel adds symbols to reels 2 to 5, while the reactions feature replaces winning symbols with new ones from above and from the right in the extra reel. This cascading format can create successive wins from a single spin.
The paytable shows wins paid on consecutive reels from left to right, with all payouts multiplied by stake. The interface also includes standard controls such as Pays, Auto, Options, and Help, along with blue-and-gold show-style graphics and a studio-themed presentation.