really excellent and tons of fun. not a single bad puzzle in here and many great ones. rot13 for spoilers:
v ernyyl ybirq gur nohaqnapr bs zrgnchmmyrf, nyjnlf orra zl snibevgr guvat va n tnzr. hasbeghangryl v svtherq bhg ribxr orsber v unq qbar nyzbfg nal bs gur nccraqvk chmmyrf whfg orpnhfr v'q fbyirq gur znc chmmyr sbe sybbe 1 irel dhvpxyl jura v jnf ybbxvat pybfryl ng gur znc, juvpu yrq gb zr fcraqvat n ohapu bs gvzr cynlvat jvgu sybbe 2'f znc naq ernyvmvat gung genpvat gur cngu sebz sybbe gb sybbe tnir lbh yrggref. sebz gurer ribxr vf rkgerzryl dhvpx gb erirny.
gur ynpx bs nal fbeg bs "pvcuref" vf dhvgr avpr ohg va pnfrf yvxr guvf, vg znxrf zr jbaqre vs fbzr fbeg bs pvcure jbhyq or zber nccebcevngr va gur yngr tnzr? fbzrguvat gung lbh pbafgehpg hfvat cvrprf lbh trg qhevat gur tnzr, fvzvyne gb jung lbh qvq jvgu hfvat gur obkrf ng gur raq gb thvqr cynlref gb ernyvmr gur zrgnf rkvfg. naljnlf, pna'g ernyyl avgcvpx zhpu, guvf jnf n jbaqreshy naq serr rkcrevrapr. gunax lbh sbe znxvat guvf!