Boss Rush Upgrades Guide for Boss Rush
Boss Rush Upgrades are a progression feature in Boss Rush that was introduced during the Escanor Update. Players can access this system at Sailor Island and spend Boss Rush Coins on permanent stat upgrades that improve performance in Boss Rush runs.
What Are Boss Rush Upgrades?
Boss Rush Upgrades let players invest Boss Rush Coins into five different stats: Damage, Critical Damage, Critical Chance, HP, and Luck. Each upgrade has five levels, and maxing every category costs a total of 6,625 Boss Rush Coins.
- Location: Sailor Island
- Feature added: Escanor Update
- Total upgrade cost: 6,625 Boss Rush Coins
Boss Rush Upgrade Costs
Damage
- Level 1: 100
- Level 2: 150
- Level 3: 250
- Level 4: 350
- Level 5: 500
- Total Cost: 1,350
Critical Damage
- Level 1: 100
- Level 2: 150
- Level 3: 250
- Level 4: 350
- Level 5: 500
- Total Cost: 1,350
Critical Chance
- Level 1: 100
- Level 2: 150
- Level 3: 250
- Level 4: 350
- Level 5: 500
- Total Cost: 1,350
HP
- Level 1: 75
- Level 2: 100
- Level 3: 150
- Level 4: 200
- Level 5: 300
- Total Cost: 850
Luck
- Level 1: 125
- Level 2: 200
- Level 3: 300
- Level 4: 450
- Level 5: 650
- Total Cost: 1,725
Max Upgrade Bonuses
At maximum level, Boss Rush Upgrades provide the following total stat bonuses in Boss Rush:
- Damage: 25 total (+5% per level)
- Critical Damage: 15 total (+3% per level)
- Critical Chance: 5 total (+1% per level)
- HP: 37.5 total (+7.5% per level)
- Luck: 15 total (+3% per level)
Boss Rush Rules and Reward Requirement
Each Boss Rush run has 15 waves and a 300-second global timer. To receive end-of-run rewards, players must deal at least 10% of the total rush HP.
If another player is in the dungeon, boss HP increases by 55% per additional user.
Boss Rush HP by Difficulty
Easy
- W1: 90M
- W2: 112M
- W3: 135M
- W4: 180M
- W5: 225M
- W6: 270M
- W7: 315M
- W8: 360M
- W9: 450M
- W10: 585M
- W11: 720M
- W12: 900M
- W13: 1.08B
- W14: 1.35B
- W15: 1.8B
Medium
- W1: 270M
- W2: 338M
- W3: 405M
- W4: 540M
- W5: 675M
- W6: 810M
- W7: 945M
- W8: 1.08B
- W9: 1.35B
- W10: 1.75B
- W11: 2.16B
- W12: 2.7B
- W13: 3.24B
- W14: 4.05B
- W15: 5.4B
Hard
- W1: 675M
- W2: 844M
- W3: 1.01B
- W4: 1.35B
- W5: 1.69B
- W6: 2.02B
- W7: 2.36B
- W8: 2.7B
- W9: 3.38B
- W10: 4.39B
- W11: 5.4B
- W12: 6.75B
- W13: 8.1B
- W14: 10.12B
- W15: 13.5B
Extreme
- W1: 1.8B
- W2: 2.25B
- W3: 2.7B
- W4: 3.6B
- W5: 4.5B
- W6: 5.4B
- W7: 6.3B
- W8: 7.2B
- W9: 9B
- W10: 11.7B
- W11: 14.4B
- W12: 18B
- W13: 21.6B
- W14: 27B
- W15: 36B
Time Tiers
Boss Rush rewards are influenced by clear speed. The available time tiers are:
- SSS: Clear in 30 seconds or less
- SS: Clear in 60 seconds or less
- S: Clear in 120 seconds or less
- A: Clear in 180 seconds or less
- B: Clear in 240 seconds or less
- C: Clear in 300 seconds or less
Rush Coin Rewards by Difficulty
Easy
- SSS: 2-6
- SS: 2-5
- S: 2-4
- A: 2-4
- B: 2-3
- C: 1-3
Medium
- SSS: 3-8
- SS: 3-7
- S: 3-6
- A: 2-5
- B: 2-4
- C: 2-4
Hard
- SSS: 5-10
- SS: 4-8
- S: 3-8
- A: 3-7
- B: 3-6
- C: 3-5
Extreme
- SSS: 8-14
- SS: 7-12
- S: 6-11
- A: 5-9
- B: 4-8
- C: 4-7
Best Way to Farm Boss Rush Coins
Based on the provided strategy notes, the most efficient way to grind Boss Rush Coins is to run with two other players around your power level and clear the easier modes quickly. This works because faster runs can still produce strong coin income without the much higher difficulty of later modes.
- Running with two similarly strong players can improve farming consistency.
- Easy or normal-speed clears are recommended for efficient AFK-style farming.
- Medium mode is listed as a strong farming option when you can clear it in under 1 minute.
- Extreme mode is not recommended for coin farming due to the difficulty.
For AFK-friendly melee choices, the provided recommendation is Gojo V2 and Gilgamesh. Sword is described as less effective for this mode because it has weaker AFK farming potential.
Estimated Time to Max All Boss Rush Upgrades
Using the provided estimate, a player farming Medium mode in under 1 minute with roughly S or SS completion can average around 6 to 7 Rush Coins per clear.
- Total cost to max upgrades: 6,625 Boss Rush Coins
- Average coins per clear: 6 to 7
- Estimated clears needed: about 950 to 1,100
- Estimated clears per hour: about 60 or slightly less
- Estimated total grind time: around 17 to 20 hours
This estimate is presented as an average-case benchmark. Stronger players who can handle higher damage output or faster clears may finish the full upgrade grind more quickly, and some players may choose to move into Hard mode if their damage is high enough.
Final Thoughts
Boss Rush Upgrades are one of the main long-term progression systems in Boss Rush. Since the total cost is high, efficient farming matters just as much as raw power. Players who want to max every upgrade should focus on fast clears, reliable team setups, and coin-efficient difficulty choices rather than only pushing the hardest mode available.