It took several months, but you can finally play the Wii U versions of Mario Kart 8 and Splatoon online. Nintendo has confirmed that both titles will once again be available for multiplayer as of August 3rd. The company has fixed the security vulnerability that prompted the shutdown of online service in March.
Nintendo still hasn't detailed the flaw. However, enthusiast and tinkerer OatmealDome claims the last-gen console is vulnerable to an "ENLBufferPwn" attack that lets intruders take over the console when it goes online. The company reportedly fixed the bug last year for affected Switch titles well as Mario Kart 7, but didn't make a similar effort for the Wii U versions until now.