Must Add ''changelevel'' First. Or else it won't Work
example, changelevel sp_a1_intro1
Chapter 1 - The Courtesy Call
sp_a1_intro1 //Relaxation Vault
sp_a1_intro2 //Original 1
sp_a1_intro3 //Original 2
sp_a1_intro4 //Original 3 and 4
sp_a1_intro5 //Original 5
sp_a1_intro6 //Original 6
sp_a1_intro7 //Original 7
sp_a1_wakeup //GLaDOS
sp_a2_intro //Original 19
Chapter 2 - The Cold Boot
sp_a2_laser_intro //GLaDOS 1
sp_a2_laser_stairs //GLaDOS 2
sp_a2_dual_stairs //GLaDOS 3
sp_a2_laser_over_goo //GLaDOS 4
sp_a2_catapult_intro //GLaDOS 5
sp_a2_trust_fling //GLaDOS 6
sp_a2_pit_flings //GLaDOS 7
sp_a2_fizzler_intro //GLaDOS 8
Chapter 3 - The Return
sp_a2_sphere_peek //GLaDOS 9
sp_a2_ricochet //GLaDOS 10
sp_a2_bridge_intro //GLaDOS 11
sp_a2_bridge_the_gap //GLaDOS 12
sp_a2_turret_intro //GLaDOS 13
sp_a2_laser_relays //GLaDOS 14
sp_a2_turret_blocker //GLaDOS 15
sp_a2_laser_vs_turret //GLaDOS 16
sp_a2_pull_the_rug //GLaDOS 17
Chapter 4 - The Surprise
sp_a2_column_blocker //GLaDOS 18
sp_a2_laser_chaining //GLaDOS 19
sp_a2_triple_laser //GLaDOS 20
sp_a2_bts1 //GLaDOS 21
sp_a2_bts2
Chapter 5 - The Escape
sp_a2_bts3
sp_a2_bts4 //Turret Assembly Line
sp_a2_bts5 //Neurotoxin Generator
sp_a2_bts6 //Tube ride (no gameplay)
sp_a2_core //Core Swap
Chapter 6 - The Fall
sp_a3_00 //Falling
sp_a3_01 //Ruins
sp_a3_03 //Initiative Intro, Alpha Pump
sp_a3_jump_intro //Blue Gel 1
sp_a3_bomb_flings //Blue Gel 2
sp_a3_crazy_box //Blue Gel 3
sp_a3_transition01 //Beta Pump, Potato
Chapter 7 - The Reunion
sp_a3_speed_ramp //Orange Gel 1
sp_a3_speed_flings //Orange Gel 2
sp_a3_portal_intro //Gamma Pump, White Gel 1
sp_a3_end //Master Pump
Chapter 8 - The Itch
sp_a4_intro //Wheatley intro
sp_a4_tb_intro //Wheatley 1
sp_a4_tb_trust_drop //Wheatley 2
sp_a4_tb_wall_button //Wheatley 3
sp_a4_tb_polarity //Wheatley 4
sp_a4_tb_catch //Wheatley 5
sp_a4_stop_the_box //Wheatley 6
sp_a4_laser_catapult //Wheatley 11
sp_a4_laser_platform //Wheatley 12
sp_a4_speed_tb_catch //Wheatley 15
sp_a4_jump_polarity //Wheatley 16
Chapter 9 - The Part Where…
sp_a4_finale1 //Wheatley 17, This is that part.
sp_a4_finale2
sp_a4_finale3
sp_a4_finale4 //That happened.
sp_a5_credits //Credits