Multiversus rested XP is a special system wherein players get extra experience for the battle pass when they play matches daily, with greater rewards for playing one match a day for a month that simply playing thirty matches in one day. Rested XP is a special bonus multiplayer added on to the experience you earn, but that bonus depletes with use - then comes back passively over time. The longer you're logged out and away from your console for, the more the Rested XP bonus recharges.
Rested XP is a fairly significant bonus too, one that can do as much to double the XP that players earn in matches, whether won or lost, so it's worth understanding what it does. We'll explain the full details of Multiversus rested XP below and how you can use it to your advantage to level up fast.
Rested XP in Multiversus and how it works
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Multiversus rested XP acts as a kind of temporary bonus to Battle Pass progress to experience that resets at the beginning of every day. You can actually see that bonus represented by a swirling pink bar under the main "play" option in the main menu.
Players get an increase to XP when the bar is still at least partly full, but as they play more matches the bar decreases with each completed game, whether teams, FFA, or MultiVersus 1v1. Once the bar is fully empty, there's no more rested XP bonus.
Still, that doesn't mean that you get no experience for players matches with no bar! Rested XP only adds extra to what you're already earning, rather than reducing it. When the bar is full you effectively have a x2 bonus, and when it's empty you're back to the standard of x1.
If the bar runs out, the only way to get it back is to wait until tomorrow. Rested XP is a mechanic designed to encourage players to keep coming back day-after-day, rather than playing obsessively for hours at a time infrequently. Keep in mind that Rested XP doesn't seem to do anything for coins you earn, though the XP will help you to earn a lot of rewards - assuming the Multiversus servers are online.