Gameplay
The game is divided into three difficulty levels. Higher difficulties have more puzzles and more death encounters. In this game, the left mouse button is used for selecting options and performing actions and the right mouse button is used to look at things (an alternative to selecting the 'look' option and selecting where). Some actions like sitting on a chair are automatically performed with just a left click. There are 10 different options, 2 of which are used to interact with people and 7 of which are used to interact with objects. Items that are picked up have their own sub-options, most of which Rex won't actually do (such as disassembling his binoculars). To get from one room to another the mouse pointer changes to a 'GO' icon where travel is possible. To get from one place to another, Rex will need to make use of teleporters correctly entering the code. The player must also take care to prevent Rex getting killed which can happen in many places. Although Rex can die, the game has unlimited chances and the Rex's last safe position will be restored after death.
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