Screenshots can be very helpful sometimes 😃👍
What colour key are you having issues with?.....Red, Blue or Green?
Have you checked your Inventory Backpack to make sure that you have collected the keys?
If the keys are not in your Inventory Backpack....go back & check that you actually picked them up....it's sometimes easy to miss picking items up.
Have you tried completely shutting down your game & restarting it?
Have you checked out the relevant Wiki pages, quests, maps, videos, guides, walkthroughs & hidden gifts.
In certain scenarios it is much more easier to consult, study & follow the Wiki maps instead of the videos.
You can easily find the solutions to puzzles if you check out the Wiki maps.....everything is clearly & concisely highlighted....including hidden gifts.
The Wiki pages & this forum will become your best friends throughout your Diggys Adventure journey.
Mines, Maps & Videos
Fan Based Websites