Time per map: 30 minutes.
Updated: 2017 May 10

Tier 1:
surf_kitsune
surf_rebel_resistance_njv
surf_prelude_ksf
surf_ninja_go_b5
surf_lux
surf_trance_ksf
surf_legends_lite_gfl
surf_utopia_v3
surf_aircontrol_ksf
surf_beginner
surf_derpis_ksf
surf_how2surf
surf_lessons
surf_lullaby_ksf
surf_mesa
surf_water-run_banjo_skill
surf_mom
surf_borderlands
surf_calycate2
surf_duggywuggy
surf_escape_final
surf_half_baked
surf_lament_n2p
surf_life_of_duck_go
surf_resort_jk

Tier 2:
surf_atlas_1
surf_eclipse
surf_fruits
surf_hurrr
surf_island
surf_mesa_mine
surf_wood
surf_vegetables
surf_waterworks
surf_tensile_njv
surf_sundown_njv
surf_rookie
surf_amplitude_encore_nsf_v4
surf_amplitude_light
surf_grassland
surf_happyhands_test
surf_ing_njv
surf_aweles
first_to_finish
surf_colours
surf_colum_up
surf_epicube_ksf
surf_glass9
surf_hat
surf_juturna
surf_lavaflow
surf_lies_ksf
surf_lore_e
surf_oma
surf_spacejam
surf_wahey

Tier 3:
surf_acp
surf_asrown
surf_bbb
surf_cyanide_njv
surf_fast
surf_forbidden_tomb_sns
surf_healthy_e
surf_liberation2
surf_spectrum_njv
surf_refraxis
surf_frequency_njv
surf_lighthouse
surf_liberation2
surf_depths
surf_sc_essence_v2_njv
surf_olympics_sns
surf_be_gentle
surf_exxak
surf_meme
surf_nitro
surf_physics