A hospice is challenging people to abseil from the i360 pod at night while it is at its highest point.
Martlets will hold its iDrop fundraiser on March 30 - starting 450ft above Brighton beach.
The hospice, based in Hove, says the challenge is open to anyone aged 14 or older and no experience is needed.
Charlotte Bolton of the hospice's events team said: "If you are the kind of person who likes to challenge yourself then the Night i360 iDrop is definitely for you.
"It is a physical event but it is something that anyone can do with a bit of bravery and lots of encouragement from their supporters."
She added: “Our life-changing hospice care is only free thanks to the generosity of the people of Brighton & Hove. So sign-up now, challenge yourself and really make a difference.”
It costs £50 to register for the iDrop and the hospice is asking those that take part to raise a minimum of £250 in sponsorship.
Martlets hospice cares for people living through a terminal illness in and around Brighton and Hove.
For more details, see themartlets.org.uk