A SASBX file is a save game file created by Space Agency, a space game for Android and iOS. It contains information about a game in Sandbox mode, which includes built space stations, completed journeys, and launched rockets.

SASBX files are primarily used to save a user's progress in Sandbox mode but they may also be used to share Sandbox game progress with other users. You can do this by selecting the "Share" button in Space Agency, which allows you to send the SASBX file via email to another user. The file can then be imported into Space Agency on the user's Android or iOS device. Space Agency allows you to build rockets, launch satellites, create space stations, and explore the solar system. The Android version is available for free with in-app purchases, while the iOS version is only available for purchase.