Jack21 Casino is an online casino that launched in 2020 and is operated by Mountberg B.V., under a licence from Curacao Gaming Control Board. The site is offered in English, German and French, among other languages. 3 responsible-gambling tools are listed, such as deposit limits and self-exclusion. The lobby draws on 12 game suppliers, including 1x2Games, Asia Gaming and BF Games. Formats listed include Instant Play and Mobile. Accounts can be held in Russian rubles, Euros and Canadian dollars, among other currencies. Payment methods include Visa, MasterCard and Neteller, among others.