Table: gladiator_episodes
Columns: episode_number
air_date
event_1
event_2
event_3
event_4

Question: On what date was the episode aired where event 2 was Hang Tough?
SQL: SELECT "air_date" FROM gladiator_episodes WHERE "event_2" = 'Hang Tough'

Question: When event 4 was Whiplash, what was event 2?
SQL: SELECT "event_2" FROM gladiator_episodes WHERE "event_4" = 'Whiplash'

Question: On how many different dates was event 1 Suspension Bridge?
SQL: SELECT COUNT("air_date") FROM gladiator_episodes WHERE "event_1" = 'Suspension Bridge'

Question: On which episode number is event 4 The Wall and event 1 the Pendulum?
SQL: SELECT COUNT("episode_number") FROM gladiator_episodes WHERE "event_4" = 'The Wall' AND "event_1" = 'Pendulum'

Question: What was event 2 when event 1 was Atlasphere?
SQL: SELECT "event_2" FROM gladiator_episodes WHERE "event_1" = 'Atlasphere'