the combinations are on the walls near the cases, u need to use the piece of paper u find to decipher the combo...in the attic the code is ON the case. also last red candle is on bathroom window. use all 5 candles to finish game, u don't need anything else...oh use ladder u find to get to attic
how to beat on hard........start with 2 darts near entrance....then put a tack and upgrade it all the way...then ad a second tack also near entrance, upgrade that all the way...then build bomb towers 2-3 and upgrade them....then build super monkey when u can aford it....don't be afraid to use tacks or pineapples when needed.....
all you do to get higher score is increase mana...it multiples score by 8% every time... so get highest gems and increase mana as much as possible easy
 "Shooting Plane")
 "Shooting Plain")
 "Mastermind: World Conquerer")
 "Gazzoline")
 "SAS: Zombie Assault")
 "Minions")
 "Dodge")
 "Ghostscape")
 "Bloons Tower Defense 3")
 "GemCraft")