Use the 5th coin (reindeer) on the left machine.
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. Syberia 2 XLBA - Xbox 360 [Arcade]
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. Use the 5th coin (reindeer) on the left machine
You can earn all achievements in a single playthrough, but it requires playing on and finishing in under 6 hours to unlock the "Old School" achievement. Story Achievements (Unmissable): Doctor Walker: Take Hans to the Patriarch. Beastmaster: Get a Youki friend. Flying Kate: Use Boris's plane. Hansception: Enter the dream. Heartless: Witness Oscar's sacrifice. At the edge of the world: Find Syberia. On the way to Syberia: Finish the game. Missable Achievements: Finish the game on difficult mode in under 6 hours
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.