U.S. Patent
May 6, 2008
Sheet 2 0f 8
US 7,367,882 B2
FIG. 2A
DIFFICULTY LEVEL LOW
STAGE
1
STAGE
2
AREA3-1
STAGE
3
AREAS-2
STAGE 4
AREA3-3
STAGE 5
AREA3—4
STAGE 6
STAGE 7
STAGE 8
DIFFICULTY LEVEL HIGH
FIG. 2B
STAGE3
MAP DATA
ENEMY'S APPEARANCE PATTERN DATA
