The main screen shows an overview of all Sobileks created on this device or imported from another location (for example, a Sobilek that has been shared with you via WhatsApp). Sobileks can be edited or played from this main screen.

The buttons on this screen do the following:

1. Play the Sobilek. In other words: play the treasure hunt.

2. Enter the edit mode of this Sobilek. This option is only available if this Sobilek has been created on the current device, or if the "Allow editing only on this device" option has been disabled for this Sobilek (explained below).

3. Remove the Sobilek from this device

4. Share this Sobilek with others

5. Create a new Sobilek

6. Import a previously shared Sobilek by selecting a file

A Sobilek can be shared with friends using the share button on the home screen (last button on the far right). The Sobilek will be compressed into a .zip file and shared via the chosen app. From here there are two options to import the Sobilek on another device. First, the "Import" function can be used where a file can be selected from this device. It is usually easier to open the Sobilek app (e.g. from Whatsapp) and select the Sobilek app in the popup that appears (see left). The Sobilek is then automatically imported and is directly available from the home screen.

In the Sobilek editor you can create questions, add photos and videos and select locations on Google Maps. The editor has three different views; a detail view (as shown on the left), a list view and a settings view. The views can be changed using button 1 as shown in the picture on the left. From the detail view you can click on this button to siwtch to the list overview and from there using the same button to the settings view and back to this detail view. Button 2 always brings you back to the main screen.

The header bar at the top indicates the question you are currently editing (first number, see 3 in the picture on the left). The second part of this number states how many questions there are.

The text associated with this question can be entered in text field 4. This is optional, but if filled in it will be visible in play mode.

The "Code to unlock next question" field allows you to set a code that will be used in playback mode. Setting a code will blocks access to the next question until the correct code has been entered. For example, this code could be the correct answer to the question as entered in field 4.

The really interesting part of this app is in the top section of this detail view. Media can be added here in by capturing an image, a video or setting a GPS location. Button 1 provides access to the device's camera. A photo can be captured with this and it will be directly linked to this question. With button 2 any image can be associated with this question by uploading it from this device. Button 3 also opens the camera of this device, but in video capture mode. Button 4 determines the current GPS location and then shows it in Google Maps.

If a GPS location is added, the current location will initially be shown on Google Maps (see left picture). However, the location marker can be moved by holding it for a while and then dragging it to the desired location.

The location marker shows the accuracy with which the measurement was taken beneath the GPS coordinates. If the coordinate was determined by reading the current location, this shows the accuracy of that measurement. As soon as the marker is moved, the accuracy will indicate 0 meters, because in that case it is no longer applicable.

At the bottom the marker shows how the GPS location will be used in playback mode. There are two options for this, which can be adjusted using the edit button on the left:

• Show location on map - In playback mode, show this location on a Google Maps map

• Show distance to this location - In playback mode, show only the distance from the player to this location (in meters)

With the navigation bar you can navigate between the questions and questions can be added or removed:

1. Go to the first question

2. Go to the previous question

3. Go to the next question

4. Go to the last question

5. Add a new question (which becomes the last question)

6. Delete the current question

In the list view, all questions are shown in a list. This gives an overview of all questions, but more importantly; the order of the questions can be changed from this overview. A question can simply be picked up (hold it down until its selected) and released at the desired position. The question numbers are automatically updated.

The name of the Sobilek can be changed in the settings view. Here you can also set whether this Sobilek can only be edited on this device (the codes will be visible while editing), or on all devices. This option is enabled by default, because it is usually not the intention that players can edit the Sobilek and thus view the codes.