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