Synonyms for «to increase the difficulty»

improve raise add progress rise intensify enhance heighten complicate escalate make take step exacerbate advance aggravate become create boost push prove strengthen accelerate continue get give worsen achieve deepen ramp increment reach require offer learning upgrade expand generate go toughen bump bring find double keep kick magnify amp amplify

challenge problem strength complexity work level stress effort risk hardship task abilities achievement pressure degree game exercise effect resistance competition time success fitness interest power force activity demand rate performance things intensity life tension skills complications trouble amount experience issue weight number stretch speed strain costs pace scores bit