Is school boring? Do you want to practice dodging instead of listening to your History teacher?
Then type this into a new program on your calculator:
Disp "ENTER COLUMNS"
Prompt W
Disp "ENTER DIFFICULTY"
Disp "0 IS HIGHEST"
Prompt V
Lbl 1
1→B
1→C
1→D
1→E
1→F
1→G
int(W/2)→P
1→A
Lbl 0
ClrHome
getKey→M
If M=82
max(1,P-1)→P
If M=83
min(W, P+1)→P
F→G
E→F
D→E
C→D
B→C
A→B
randInt(1,7)→A
Output(2,A,1)
Output(3,B,1)
Output(4,C,1)
Output(5,D,1)
Output(6,E,1)
Output(7,F,1)
Output(8,G,1)
Output(8,P,8)
If P=G
Goto 7
0→Z
Lbl 6
1+Z→Z
If Z>V
Goto 0
Goto 6
Lbl 7
Disp "YOU LOSE."
Disp "PRESS ENTER"
Lbl 8
getKey→M
If M=105
Goto 1
Goto 8
Gameplay: You're the 8 at the bottom. Use the 4 and 5 keys to dodge the falling 1's.
If you want it to be 'nightmare' difficulty, take out the part near the beginning that says:
Disp "ENTER DIFFICULTY"
Disp "0 IS HIGHEST"
Prompt V
and the part at the end that says:
0→Z
Lbl 6
1+Z→Z
If Z>V
If you are crazy, then:
F→G
E→F
D→E
reverse these three lines.
Unfortunately, attempts at more complex danmaku slowed down my calculator tenfold.
Of course, this isn't a complete 6-stage game or anything, just a small diversion. Rika's Garage seemed like the best place to put it.