Swedish regulator Spelinspektionen issued the online games licence, which will run until 31 January 2026.
Mr Vegas offers more than 2,000 online casino games, including slots, blackjack, roulette, video poker, live casino and scratchcards. The operator also holds a licence from the Malta Gaming Authority.
Sweden opened its regulated igaming market on 1 January 2019.
In November last year, Spelinspektionen reported that revenue in Sweden for Q3 of 2020 was up 1.3% year-on-year to SEK6.04bn (£523.8m/€595.0m/$716.8m).
Online revenue also increased 5.8% during the three-month period, despite the controversial SEK5,000 temporary casino deposit cap, which has applied to online casino games since July 2 last year. The cap was initially meant to last until the end of 2020, but was since extended to June 2021.