Talk with every character. Ensure you exhaust all dialogue options with everyone you meet. Snoop: Find all 13 game items.
Use the 2nd coin on the middle machine. Give this to the Youki. Monastery: Candle Puzzle Syberia 2 XLBA - Xbox 360 [Arcade]
Scan every scene thoroughly. The game is a classic point-and-click; if you are stuck, it is likely because of an uncollected item or an unexhausted dialogue. Talk with every character
Use the 5th coin (reindeer) on the left machine. Use the 2nd coin on the middle machine
To open the hidden room in the library, you must light specific candles based on the diagram from the chapel. Think of the 12 candles as a clock face. 3, 4, 8, 9, and 12 o'clock.
Call everyone on the phone. Check your contact list regularly. Memory from Aralbad: Read what happened to Helena Romanski.
Finish the game on difficult mode in under 6 hours. Key Puzzle Solutions Romansburg: Candy Machine Use the Small Key on the right-most machine to get coins.