"the secret of smiley island" is a textadventure or interactive fiction written with inform7. It used inform7 built-in mechanism to publish it as a website and I customized it to an open web app thats using appcache for offline play. So the commands "save" and "restore" are working offline also. Both the app and the story source text are available at github.
It's secure to download tsosi. The game is created by stereofon and its category is Adventure Games. This application was downloaded and installed by over 50 users and its latest stable release was on Jan 22, 2015.
You are able to get the setup package of tsosi 0.0.1 free of charge and have a look at users' reviews on Droid Informer. The app runs on Android 2.3.3 and above.