SSTO To Sarnus

[Richmountain112]

So this challenge has been floating around in my head for a while, and I know it's possible because other people tried it. But I never tried it myself. Well, I designed a craft specifically for that purpose, but it was difficult getting it to Orbit, and it contained the cheaty Nuclear Lightbulb from the Atomic Age.

Rules:
1: Must reach Sarnus without staging. 
2: Don't really care how you insert into Sarnus.
3: The Cheaper, the better. But it's also better if it's shorter as well.
4: Refueling in Orbit and/or ISRU are okay.
5: Must do something (like deploying an atmospheric probe to "land" on the gas giant or landing on one of its moons)
6: Return to Kerbin once you're done.
7: No Kraken Drives or other glitches (Makes challenge too easy. Use one and your ranking is in the Casual ranking)

Mods are allowed but no engines over 2000 isp except Ion engines and no fuel less engines (Intake air and atmospheres count as fuel)

(The atomic lightbulb is fine because it has 1500. Ion engines are okay because of their awful TWR)

Spoiler

Mods not allowed: 

TweakScale (If you have it installed, disable it on all parts)
KSP Interstellar
Extraplanetary Launch Pads
Orion Drives (All of them)

All mods except for OP mods are allowed with the exception of Atomic Age. You may use Alt-F12 while testing but not while doing the final mission.

Rankings:

Casual (Kraken drives and glitches allowed, any Mass or Cost)

1:
2:
3:
4:
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Easy: Same as Casual except no Kraken Drives, must either land on Hale and/or Ovok or deploy an atmospheric probe

1:
2:
3:
4:
5:

Medium: Any mass, must cost less than $1,000,000 and land on Tekto and/or Eeloo

1:
2:
3:
4:
5:

Moderate: Same as above but no refueling.

1:
2:
3:
4:
5:

Hard: Must weigh less than 500 tons, cost less than or equal to $500,000 and/or Direct Ascent to Slate, may or may not land on the other moons.

1:
2:
3:
4:
5:

Impossible: Must reach an altitude of Zero KM on Sarnus and return to Kerbin.

1:
2:
3:
4:
5:

Challenges may need some refining later on.

Edited December 22, 2022 by Richmountain112
Added leaderboard.