Hill Climb Racing is free to play and offline but there are optional in-app purchases available.
JackOGunner
SuperLongNoseDog
PushIt
StackedBlock
MadTaxiTime
RopeDude
DriveBoat
CleanHouse3D
ArcherWarrior
SummerDessertParty
NeonSwitch
ElasticMan
PowerBadminton
NumpuzClassic