Hard Level
"Hard level" in the description of the quest indicates that the there is a certain amount of points you need to collect in the limited amount of moves to complete the level.
But don't worry, some levels may seem hard, but it is always possible to complete them without additional moves!
Triple Quest Level
In the Triple Quest Level you will have to gain a certain amount of points on each stage. For each stage a Tocken will be withdrawn.
Losing at any of the stages you will have to start the Quest anew.
Quest Level "Score XX points"
In this type of Quest you will have to gain an XX amount of points throughout all stages to complete the Quest.
After each stage of the Tripple Quest Level you may quit the attempt.
If you think that amount of gained on the first or second stage of the Triple Quest will not allow you to complete the whole quest, you can always quit the current attempt and start the quest anew.