This is an app for those who know how to "watch" stereograms. If you don't know how to view stereograms, I suggest that you search the internet to find a way to stereogram. After you master the skills to stereogram, then you can try this app. All the stereograms in this app are created by me.
There are total 50 stereograms, hope you can enjoy them.
To Logan Night: the first password, the number in the stereogram is some 3d numbers, not 2d flat numbers. If you try to input wrong number 3 times(after three enters), the real 3d number will appear, then you know how it looks.