Gameplay
Space Taxi is an action game. There are 24 different levels, all in sequential order, and the player has to complete all of them.
Space Taxi simulates a flying taxi. The taxi is controlled by four thrusters and has landing gear that can be switched on or off. Switching landing gear on disables the side thrusters, but landing without landing gear destroys the taxi. The taxi also crashes when colliding with the environment, landing with high velocity or not landing properly (i.e. having only one of the gear stands on the platform while having the other in midair).
In each level, there is a set of numbered platforms. At regular intervals, a customer materializes out of nowhere, on a randomly selected platform. The player has to fly their taxi to that platform, whereupon the customer will enter the taxi, saying which platform he wants to go to. When the player takes him to that platform, he will pay the taxi fee and tip based upon how fast the trip takes and the smoothness of the landing. After each numbered platform has been successfully visited, the next customer will say "Up please", whereupon the gate at the top of the level will open. Flying through the gate completes the level. One must also be careful not to land on or hit the customer with the taxi, not only because he will angrily yell "HEY!" and then disappear, before appearing somewhere else on the platform, but also deduct money from your total earned. This is increasingly difficult on smaller platforms where the platform will barely fit the customer and the taxi.
Each level features a different setting or theme (such as a treat-strewn candyland or a snowy winter landscape), and most have some special feature to hinder the player's job. Some of the features include a table tennis ball bouncing across the level, snowflakes falling from the sky, a series of radar masts interfering with the controls, or teleports that send the player to a random location.
The taxi also has a limited fuel supply. The fuel level resets at the end of each level, but on some of the more complicated screens it is necessary to refuel. This is accomplished by flying to a special platform marked with an "F" and containing a gas pump. The player must pay for fuel out of the money he has earned. Passengers do not make allowances for pitstops, and their tip will continue to decrease as the player tanks up. The taxi's fuel consumption is based upon the time spent in the air, not how much the thrusters are used, so if a player needs to get from one side of the screen to the other, it consumes less fuel (though is more dangerous) to accelerate halfway across the screen and then reverse thrust, than to use one small thrust to move slowly across the screen and occasional upward thrusts to maintain altitude.
After completing all levels, the player gets to a special "mystery level", in which the player is greeted with the message "Welcome to... MUSEWORLD" and three platforms, each with a figure relating to another Muse Software game: an ambulance representing Rescue Squad (1983, also John F. Kutcher), the soldier with Hakenkreuz for Castle Wolfenstein (1981, Silas S. Warner), and a shooting robot relating to RobotWar (1981, Silas S. Warner).
At the bottom below there is the actual mystery of the "secret screen", the text says: "Eat the pie until a "fire" glows, then go up until it stops, touch a star and you'll see the Secret Menu!!!". The bold words here are highlighted in the game in a different color and are the keys to get into the Secret Menu. Therefore the player must first enter the instruction page (by pressing joystick down in the main menu) and type in the keys related by the highlighted words: First pressing the π-key until the word "fire" in the last line changes its color, then pressing the ↑-key (not the cursor key) until the color gets black again. Then the player presses * and he or she will get to the "secret menu" with the following options: Record own demo, disable sprite kill, manual select for random levels and author information.
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