I would like to offer assistance for the people out there who are stuck on this game!

Ways to make bolts:

1) Arena-my old favourite. the best way to roll in those bolts do all the challenges possible great because you get ammo back in the next challenge!

2) walk round levels and kill stuff a great way to make bolts but make sure you dont have to waste them all on ammo...

3) The Sewer Chrystals on Aquatos! - Help the plumber! ok first of all this is not a good place to go with low health and no armour!

I came back here with around 90 nanotech and the 2nd armour. What you realy need is the Quack-O-Ray YES I KNOW PEOPLE THINK IT ISNT SO GOOD!

A level 3/4 quack-o-ray is the greatest way to get through the sewers ever! literaly.

No ammo needed take my word for it
all you need to do is hold down O and go go go!

Instantly anything is turned into ducks with 3/4 version quack o ray even the giant amoeboids! (yes even the ones with sewer chrystals in) also another recomendation is make sure you have the gravity boots- very useful.

Also in this place, going round the entire sewer just getting the bolts from the amoeboids is about 50,000 bolts worth! and then the entire set of sewer chrystals is about two hundred thousand bolts (and thats not even in chalenge mode!)

Upgrading weapons:

Arena- Once again anihilation nation is one of the best places to do two things collect bolts and upgrade weapons. and if you are struggling to kill the two champions it is simple - use the annihilator (becomes the decimator) and the "scorpio" or big robot thing that fires flaming chainsaws throught the ground at you and has flamethrowers? use a level 3/4 flux rifle kills it in a few shots!

also i find that the sewers in aqautos can be good for upgrading weapons as i find the plasma whip incredibly useless a good ali is the lava gun though

Weapon ugrades:
Annihilator - Deciator
Glove of Doom- Glove of dread
Bouncer - Heavy Bouncer
Nitro Launcher -
Lava gun - Liquid Nitrogen gun
Mini turret glove - Mega turret glove
Spitting Hydra -

Oh and the gadgetron PDA (if you manage to find it at quarks secret hide out)
is not worth buying believe me!

I have not discovered the wonders of the "RY3NO" yet but i know it ONLY upgrades 5 times!

You need titanium bolts to unlock these skins.
Old School Ratchet:From R&C1/free with save file from R&C1
Snowdude / 6 Bolts
Tuxedo Ratchet / 6 Bolts
Bugnoid / 6 Bolts
Brainius(B2 Brawlers cousin!) / 6 Bolts
Constructobot / 6 Bolts
Robo Rooster / 6 Bolts
Trooper / 5 Bolts
Robo(Crazy dancing robot!) / 5 Bolts

You want the eaiset way to get money well all you got to do is do all the optional mission and level missions.

The eaiest way to make your stats go up is to use on gun for instince the flux rifel my favorite it . If you ever get in to a mix here is a good tactic, get a holo shield and it will protect you long enough to attack your foe.

Look at the top left of your screen.

You will see what weapon you are using, the bar under it means how much until it gets upgraded, when its full it upgrades!

(Although some weapons can't be upgraded).