Sharing a Hidden Tip!

I'm posting a tip because I've received a few inquiries in posts and comments. The hidden way to level up is by opening chests (auto-open is possible, set it to stop when the highest reward appears). Receive all rewards as chests. (This includes 5-minute rewards, white rewards from the event page, etc. After collecting all chest rewards, climb stages). Especially for the daily 'begging' feature, increase your reputation and buy chests full with diamonds every day. (Diamonds can be easily obtained from login rewards and first-come, first-served rewards). Have fun playing everyone, and I hope you clear the hidden stage easily. It seems the heat will pass soon, so hang in there and be happy.