Wiggler and Shy Guy are added as playable characters, while the game also gets two new golf courses and modes.
Nintendo has also provided updated sales figures for Mario Golf: Super Rush and New Pokemon Snap.
The new courses are Spiky Balms and Blustery Basin, each with their own obstacles and hazards. CPU Skill can also now be adjusted.
The first free update for the golf game has added some interesting new things, in addition to also bringing improvements to the motion controls.
4.45 million Switch consoles were sold while software sales hit 45.28 million sold in the three month period ending June 30th.
Meanwhile, Mario Golf: Super Rush claims third place, and also enjoys the biggest ever launch for a Mario Golf game to date.
Mario Golf: Super Rush sells over 31,000 units during its second week in Japan, while the Nintendo Switch is once again the highest selling console.
Nintendo's golf sim remains on top in a week without big release. Ratchet and Clank: Rift Apart drops to sixth while Scarlet Nexus falls to 26th place.
It's an eventful week for the Japanese sales charts, with seven games in the top 10 being new releases. Switch tops the hardware charts again.
Ratchet and Clank: Rift Apart is pushed down to third place, while Bandai Namco's Scarlet Nexus debuts in eighth position.
A day 1 update for Mario Golf: Super Rush fixes a number of bugs and adds some features and content to its Golf Adventure mode.
More details and gameplay footage for the upcoming Mario Golf: Super Rush surface during the latest Nintendo Direct at E3 2021.
Utilize different abilities and partake in four player matches online.
With full support for motion controls.