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Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today. # Can't really understand clearly enough what the question requires me to do? Any help?

I've done the solution that I implement into my own dungeon game. However it doesn't seem to work here. Any pointers would be appreciated.

kind regards,

movement.py
```# EXAMPLES:
# move((1, 1, 10), (-1, 0)) => (0, 1, 10)
# move((0, 1, 10), (-1, 0)) => (0, 1, 5)
# move((0, 9, 5), (0, 1)) => (0, 9, 0)

def move(player, direction):
x, y, hp = player
x1, y1 = direction
if x1 == 0:
hp-5
if  x1 == 9:
hp-5
if  y1 == 0:
hp-5
if  y1 == 9:
hp-5

return x, y, hp
```

You haven't changed the original x, y coordinates.

```# using your code as an example where:
x1, y1 = direction
# change x, y values according to direction
x, y = x + x1, y + y1
```

Then

```    if x > 9:
hp -= 5
x -= 1
elif x < 0:
hp -= 5
x += 1
```

Do the same for y-value and return x, y, hp

```# -= is called a decrement
x -= 5
# is the same as
x = x - 5

# += is called an increment
x += 5
# is the same as
x = x + 5
```

Sorry Fahad, x2 should be y1. I changed it in my code example. Hi Leonard Bode, I know you've already answered my question. However I am still a bit hung up on the purpose of:

```x -=1
```

and

```x+=1
```

I would just like to know what role do they play in this task. I am asking this as it will help me understand the question a bit more.

No problem, Fahad. If you look back to my answer you see that we change the values of x or y depending on direction.

```def move(player, direction):
x, y, hp = player
x_move, y_move = direction
# here we change x, y according to direction
x, y = x + x_move, y + y_move
# then we check if x or y is some invalid integer
if x > 9:
# if it is an invalid integer, like 10 or -1, we remove 5 health points and return the player to a valid integer
# in this cases, x is greater than 9, ie 10. Therefore, we remove 5 hp and make x = 9
hp -= 5
x -= 1
elif x < 0:
hp -= 5
x += 1
elif y > 9:
hp -= 5
y -= 1
elif y < 0:
hp -= 5
y += 1
```

Then, if x or y is greater than 9 or less than 0, we subtract 5 from health because the player ran into a wall, and we return the player to a valid x, y coordinate.

```    if x > 9:
hp -= 5
x -= 1
```

Because we assume that if x > 9 then x must be equal to 10, the above code is the same as this:

```    if x == 10:
hp -= 5
x -= 1

# and the above code is the same as saying:
if x == 10:
hp -= 5
x = 9
```

So,

```x -= 1
```

just returns x to a valid integer.