GpopsBbad
All this information was provided in the forum thread link I posted above for you previously.....so that you could read it there.
Also refer the post above by Roeland....it's explains that some older events need you to do some of the Challenge Mines to gain the required number of Event Special Items to be able to receive the Achievement gold medal.
Check out the relevant Wiki page, maps, videos, guides, walkthroughs & hidden gifts/bonuses in these links
You will generally find that the hidden gifts/bonuses are clearly marked on the maps created by Roeland which are contained in these links below
https://wiki.diggysadventure.com/index.php?title=Alice_in_Wonderland
https://forum.pixelfederation.com/diggysadventure/d/188749-alice-in-wonderland-maps-videos-hidden-bonuses-information-more
https://forum.pixelfederation.com/diggysadventure/d/178422-alice-in-wonderland-hidden-goodies/55
https://diggysvideohelp.com/alice-in-wonderland/

