# Mars Lander Fuel puzzle discussion

### Level 2 - Fuel Optimization

hy i am not able to control hs speed â€¦ any idea ?

You can adjust the angle, to control hs speed.

Much as you can watch a replay of other playerâ€™s multiplayer games by browsing the leaderboards, I think being able to watch a replay of the results of other playersâ€™ optimization submissions would be very educational. Wouldnâ€™t it be nice to see how the #1 coder landed the Mars Lander with so little fuel expenditure? Of course this is hampered a bit by the fact that the actual scored verifications arenâ€™t even visible to the submitter. Is this something we could see in the future please?

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I agree. Or simply the maximum remaining fuel achieved in individual test cases (not just the the sum for all test cases) is useful too.

Achieved figures for reference:
Test case 2.1: 341L
Test case 2.2: 372L
Test case 2.3: 517L
Test case 2.4: 545L
Test case 2.5: 728L
Total: 2503L

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Hello

Did anyone ever try to figure out theoretical maximum limits for each tracks ?

I mean the first obvious limit is the starting fuel.

But then taking into account starting position plus other parameters and constraints, there should be some mathematical formula to devise a fuel limit.

Iâ€™m not from a math background but I made some calculation of this kind for the first track removing the X component that gave me a limit of 364 (by removing X component i mean moving the ship right over the landing ground in the problem, allowing a straight landing).

But I just canâ€™t figure how I could integrate the X component into the calculation.

For X movements implies angle rotation which impact Y so itâ€™s more complicated.

Anyone got a an idea ?

Hey !

I just achieved the first 3 test cases using a not so intelligent algorithm

Now Iâ€™m facing the two last test cases and clearly my tinkering will not be enough. I have to get out of my confort zone and learn new things, which is why Iâ€™m here, but I really donâ€™t know where to start.

If someone has some guidelines or a link with some theory I could use itâ€™ll be appreciated. Not looking for a solution but something to understand and then use in my code. (It can be in French or English).

Achieved figures for reference:
Test case 2.1: 338L
Test case 2.2: 367L
Test case 2.3: 510L
Test case 2.4: 539L
Test case 2.5: 722L
Total: 2475L