He's trying to understand the tutorial "https://www.scirra.com/tutorials/846/easy-way-to-put-any-ad-into-our-games". how do I make the bike more resistant?
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no idea ?
What do you mean by 'more resistant'?
If you mean more resistant to damage then:
Can you follow and understand the code?
Have you looked at the 'Damage' group.
As an example, disabling Events 33 and 34 will allow more leeway in damage.