Police have not tracked down the perpetrator, believed to be a boy aged 15 to 17.
The victim was found outside Björngårdsvillan in Slottskogen at 8 pm.
Both he and a witness were able to provide police with a description of the attacker.
A 13-year-old boy is believed to have suffered a punctured lung after being stabbed in the chest in a Gothenburg park on Sunday evening.
Police have not tracked down the perpetrator, believed to be a boy aged 15 to 17.
The victim was found outside Björngårdsvillan in Slottskogen at 8 pm.
Both he and a witness were able to provide police with a description of the attacker.