To give Horace infinite lives:

POKE 26429,0

By default, Horace gains an extra life every 10,000 points. To change that to every 1000 points:

POKE 26072,232: POKE 26073,3

Or to every 100 points:

POKE 26072,100: POKE 26073,0

To change the points awarded for eating a cherry or strawberry from 50 to N (0<=N<=65535):

To change the points awarded for eating a flower from 10 to N (0<=N<=65535):

The lunch-drop countdown timer at 7C65 is initialised to 2000 whenever Horace enters a maze, and reset to a value between 800 and 1823 inclusive after a guard has dropped his lunch. To make sure the timer is always initialised and reset to N (0<=N<=65535) instead:

To change the points awarded when Horace sounds the alarm from 210 (60 + 150) to N (0<=N<=65535):

To change the points awarded for throwing the guards out of the park from 100 to N (0<=N<=65535):

When Horace sounds the alarm, the guards will panic for a while and then calm down. To make the guards panic until Horace throws them out of the park:

POKE 26198,0

Alternatively, to make the guards panic until Horace leaves the maze:

POKE 26198,0: POKE 26307,1

To enable Horace to throw the guards out of the park even when he hasn't sounded the alarm:

POKE 26287,0

To allow Horace to roam the park without fear of being caught by a guard:

POKE 26276,201

It's not fair that the guards can catch up with Horace by following him through a tunnel. To make Horace's passage through a tunnel much quicker:

POKE 25451,1

To make the tunnel in maze 1 accessible from both sides (like the tunnels in maze 2 and maze 4):

POKE 29735,9: POKE 29736,9