It's a trick that supposedly only works if you've completed the ARMS tutorial when the beta was live. But if you have, and you want to muck around with ARMS' warmup mode before the next beta window opens, there might be a way.
NefariousSquid discovered that - again, only if you have save data past the tutorial - if you enable proxy settings and set the server address to a fake IP, you can fool around with some target practice for a couple of minutes.
Here's the full list of instructions from NefariousSquid:
- On your Nintendo Switch, go to System Settings -> Internet -> Internet Settings -> [your network] -> Change Settings.
- Enable proxy settings, and change the server address to 126.96.36.199 (or some other fake address).
- Save, then open the ARMS Global Testpunch.
- Select Party Match, select a character, then go to Warm-Up.
If you haven't played the beta yet, you'll be presented with a tutorial for either one or two players - but you won't be able to try either. So this is really only a way for people who have already spent an hour or two with the game to continue warming up until the beta reopens on June 3.
For those who did play in the beta, give this a go. Especially since Nintendo has got about a week to patch it out.