If a tile contains a clue, it will display an arrow pointing you in the direction of the next tile hiding something. Arrows must point towards the next one, but they do not necessarily show the optimal direction to look for, here is an example of how arrows provide information to uncover a reward.
In the example, green tiles are tiles that could contain the main reward, red tiles are tiles that won't contain the main reward, grey tiles have been flipped and the star is the main reward, revealed from the start for this explanation.
Step 1: No tile flipped, all tiles could contain the main reward.
Step 2: 1 Tile flipped, the arrow only tells us the reward is found leftward from the current tile. It provides information on where the main reward is not, but does not point strictly towards the shortest path to find it.
Step 3: More tiles uncovered, notice again how arrows always provide information on the direction of the reward but do not necessarily showcase the shortest path to the reward.
Step 4: Reward found, flipped tiles remain uncovered, and a new main reward needs to be found. When the main reward is found, all indications will disappear and a new main reward will be assigned, flipping new indication tiles will point towards the next main reward