Puzzle Retreat is a real challenge in the later stages. If you've managed to conquer it for the time being, you might like some of these other games:

This + That Answers
This + That Answers
TwoDots tips
TwoDots tips
Lazors Answers
Lazors Answers
Flow Free Answers
Flow Free Answers
Pictoword answers
Pictoword answers
What's The Band Help
What's The Band Help
Hello Stars answers
Hello Stars answers
Icon Pop Help
Icon Pop Help
Icomania Help
Icomania Help
GTA 5 Help
GTA 5 Help
4 Pics 1 Word Help
4 Pics 1 Word Help
WordBrain answers
WordBrain answers
Guess The 00s Answers
Guess The 00s Answers
Pic Combo Help
Pic Combo Help
Monument Valley Videos
Monument Valley Videos
4 Pics 1 Song Help
4 Pics 1 Song Help