VC3 2025 XMAS 

Author: Longshot / Logon System
Category: Christmas Challenge
System:   Amstrad CPC 
Language: Z80A Assembly 
Len source code: 1937 bytes 
Len exe file:    45 bytes
Len code only:   45 bytes

Instructions:
Insert VC32025.DSK in any emulator (Amspirit, Winape,...) 
type RUN "STUB"

Description:
Brute force method.
200 bits of raw data allow the first half of the pattern to be displayed while the second half is built in memory in reverse.