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:

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