{SS2AH} --> {krr;enter silver}
{SS2BH} --> {krr;enter golden}
{SS2IS} --> {krr;enter crimson}
S.S. is the safe ones, and the colored portals are right there.
this is if you krr from the Well of Settlestone, (or anywhere on SS)
{AH2BH} --> {krr;west;en mirror;en bh}
{AH2IS} --> {krr;west;en mirror;en island}
{AH2SS} --> {krr;west;en mirror;en ss}
A.H. is the one with the imp. this is if you krr from Wide Gate (or anywhere on AH)
krr on BH takes you to dragon mountain. (technically draconian Lair but if you open secret here you can go up to the Center of the Mountain)
krr on Lyme takes you to the Dank Air Bubble where you can Beg Mind to create a gate from Seamus (the innkeeper) to Poseidon's realm.