Lander

Fall first, brake late

The counterintuitive truth about Lander is that thrusting less usually wins. Your craft is always being pulled down by gravity, and every burst of thrust drinks from a fuel gauge that will not refill. Beginners panic near the top, fire the engine early, and hover, which burns most of their fuel while they are still nowhere near the pad. The pad is not going anywhere. Let the craft drop for most of the descent and save your fuel for one controlled deceleration close to the ground.

Rocket engineers have a name for the extreme version of this: the suicide burn, a single braking burn started as late as you dare. It is how real reusable boosters land, and it is the cheapest landing there is in fuel terms. You do not need to fly that close to the line, but the principle holds. Every metre you fall before braking is fuel you keep.

Reading a safe touchdown

Two things have to be true when you land: your downward speed has to be gentle, and the craft has to be roughly upright. Rotation is your other enemy. If you have drifted sideways, straighten the craft and cancel that horizontal motion before you commit to the final descent, because trying to fix your angle and your speed in the last second almost never works. Feather the thrust in short taps rather than holding it down. Steady little corrections keep the craft level, while one long burn tends to fling you back up and waste the fuel you needed for the touchdown.

• Kill sideways drift early, while you still have altitude to play with.
• Aim to arrive over the pad slow and vertical, not fast and tilted.
• Smaller pads and leftover fuel score more, so a clean, efficient landing beats a scrappy one.
• If you come in too hot, a hard burn late beats a crash, but plan so you never need it.

Pad choice is part of the strategy too. The small pads pay better but punish any leftover drift, so learn your taps on the big pad first, then go chase the tight ones once your final approach feels boring. Boring is exactly what a good landing looks like.

A descent, step by step

Here is what a clean run looks like. The craft starts high with the pad off to one side. First, tip toward the pad and give one short burn to start drifting that way, then straighten up and just fall. Watch the pad slide underneath you. When it is nearly below, tip the other way briefly and cancel the drift, so you are dropping straight down with the pad centred. Now check your speed. Falling fast is fine while the ground is far, but the moment the surface starts to grow, begin feathering: tap, check, tap, check. Cross the last stretch slow and upright with the engine working in short pulses. Touch, settle, done. The whole trick is doing the sideways work early and the braking late, and never trying to do both at once.

The classic beginner failure is the sideways chase: arriving above the pad still drifting, then tilting after it while dropping. Every second spent tilted is a second your engine is not pointed at the ground fighting gravity, so the chase eats fuel twice as fast and usually ends in a tipped-over landing. If the drift is not dead by the final approach, burn upward, take a breath, and set up again from higher. Going around costs fuel, but it costs less than a crash.

Where Lander comes from

The idea dates to 1969, when a high-school student named Jim Storer wrote a text game called Lunar on his school's PDP-8 computer in Lexington, Massachusetts. There were no graphics at all. You typed a fuel burn for each ten-second step and the program printed your height and speed until you landed softly or dug a new crater. The computer maker DEC spread it far and wide, and versions turned up on nearly every machine of the 1970s. Atari turned that maths into an arcade cabinet in 1979, its first game drawn in glowing vector lines, complete with a big thrust lever to squeeze and a jagged lunar surface to set down on. Asteroids borrowed the same vector hardware later that year. The trade-off has never changed in all that time: gravity is patient, your fuel is not, and the whole game lives in that gap.