Halo Infinite Fastest Way to Level Up Battle Pass Levels

To max out the battle pass you’ll need 100,000 xp (100 levels * 1000 xp each).

The fastest way is to grind the daily rewards against bots (Multiplayer -> Bot Bootcamp), you’ll need to play 2000 games (assuming you’re starting from lvl 1):

• Each game is worth 50 xp (from daily rewards);
• Games last between 3 & 5 minutes, depending on game mode;
• When the game is over, to quickly start a new one -> esc, esc, enter;
• Any challenges that don’t require PVP or vehicles are a bonus;

The maximum number of daily rewards you can get is 50 (2500 xp), which means that you have to grind for around 4 hours & 10 minutes (50 * 5 minutes) every day.

You can max out the BP in 40 days (40 * 2500 xp = 100,000 xp).

And you still need the battle pass to unlock everything.
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Bonus:

Using an XP booster (1 hour, 11 or 12 games) should net you 1100-1200 xp, compared to 550-600 without.