I know the question of "favorite map" comes up a lot, but I notice many of the responses are the harder tiers (4 - 7), so I'm curious about what your favorite tier 1 is.
kz_micropenis or kz_chrysoprase. Very nice and well thought gameplay in a good looking environment.
Next I'd say kz_layercake, I just had more fun in the first 2.
kz_boomblock was a good time too but didn't grind it enough.
I haven't played every tier 1 though.
kz_boomblock, kz_eros_v2, kz_hyroblock or kz_rush2suck
kz_conifer, kz_dakow (skz), kz_fikablock, kz_hyroblock (some people might think i made it, i did not, it's made by kreedz himself)
kz_ghat for sure
the only tier 1s i'm good at suck balls to play
beyond that 11342 is good
Other notable mentions (some already mentioned): conifer, beginnerblock, daniel, ghat, micropenis, mz.
if some t2s like kz_victoria or kz_plains were T1 I would put them there as well.