After Moslyp rockets (boosters only, also exploded a lot) and then Mosilus rockets (liquid rockets with boosters at the very start, very heavy), I call success in reaching 1 million kilometers with Marius-type rocket. History of projects time:
Marius-1 had tri-stack of liquid fuel rockets, 2 tanks high, and only two side boosters at the top of main rocket.
First rocket to get above 'dark-blue' atmosphere.
* Haspen discovers 'stability rules', auto-SAS button and reinforcing with metal rods.
Marius-2 was like above, just reinforced and with another 'level' of liquid fuel tanks.
Height reached: around 420.000 meters.
* Haspen discovers TOGGLE KEYS.
With above discovery, I managed to do a four-stack rocket, using normal decouplers on SAS module, instead of tricoupler with decoupler on top. That was
Marius-3, and with careful toggle'ing of main rocket, it managed to get somehwere 710.000 meters.
I've noticed that there was empty space right below the SAS module-decoupler mechanism, so I stuffed booster under it. Lo and behold, so is
Marius-4 created. And then, I've 'mastered' stage buttons, so the sequence was like this:
1.Main liquid quadruple-rocket stack.
2.Main rocket's side boosters.
3.Bottom booster.
4.Main rocket, with lot's of toggling (higher altitude = less fuel burn).
I was so happy when I reached 1.000.000+ meters with it <3!
Next stop: leaving the orbit. I'm going to either longify the quadruple stacks, or convert them into sextuple-stacks. For symmetry (oh gods I love symmetry), I would add another side booster at main rocket.
PS: I'm playing this game for ~6 hours or so, and I already love it! If only I could get the newest version...