Touhou Luna Nights

The Boss Rush will be unlocked upon defeating the final boss in the Extra Stage. However, you will most certainly not be a high enough level to achieve the S rank. (I was about level 26 when I finished the game)

To earn the S rank, you must complete the Boss Rush in 6 minutes. The final boss alone would take up all of that time at the average player's endgame level, so, that means it's time to get grinding. In the final hallway of the game, 2 screens left from the final boss, are a ton of powerful late game enemies. You will need to start from the right side where the healing vending machine and save point are, clear out this hallway with Thousand Dagger spell spam (remember, freezing time will make it consume TIME instead of MP), refill at the vending machine on the right side, causing the enemies to respawn, and repeat. There IS an EXP item available at the shop, but it is extremely expensive and really only gives you about 1 or 1 and a half worth of hallway clear-outs, and the jewels could come in handy later (read below)

I grinded to level 45 (only took about 1 hr 30 mins from level 26) and was able to complete the Boss Rush in 5min 51sec, so I would consider 45 the minimum requirement. If it's too tough, try grinding to 50 (or even higher!)

As for the Boss Rush itself, Thousand Dagger spam! You may have plenty of jewels from grinding, so sell all of those (I did however keep my Sapphires and Diamonds, as they boost Attack, which could help with the Boss Rush), and purchase TIME upgrades to hold more TIME. The first 3 bosses will absolutely melt under your Thousand Daggers and you will probably clear them out in well under a minute. Bosses 4 and up are where you will need to put in a bit more effort, but again, keep hailing them with Thousand Daggers. There isn't much more to say than that. If you fail to reach the S-Rank, you can always travel back to the endgame hallway and grind more levels.

And one last note. the final boss in the Boss Rush has a lengthy 5-7 second death animation, which DOES count on your clock. Be sure you are still in the 5min 40s range or low 5min 50s range upon defeating her.

I've posted my walkthough on Youtube for your reference.

Hope you'll like it and please subscribe to my channel if you find it's useful 😉

No need to grind. Thousand Daggers is so OP you can tank all the hits and heal off the graze.

I finished the entire game never selling a single gem.

Level 36-40 is all you need. Just rush every boss spamming Thousand Daggers and nobody stands a chance against you.

If you don't manage to beat the bosses fast enough you'll at least level up in the Boss rush and can.

Just get as close as you can to each boss and Spam daggers. If they attack while you're still throwing you'll just heal.

If you have bad luck and miss too many hits and lack enough MP just stop time and work on the MP recovery.

I started Boss Rush at level 32 and I'd gain 2 levels after each run but I was never killing them fast enough. At 36 I almost had it but the final boss froze me too many times to where I lost too much time. At level 38 I was strong enough to finish the Boss Rush at 5min and 45 seconds.

Here is a video of my run, I hope it helps