10D Deadfish 7 with Time Travel and a Multiverse

10D Deadfish 7 with Time Travel and a Multiverse is a joke esolang created in 2023.

Commands

i - increment current timeline's current universe's number
I - increment every number
d - decrement current timeline's current universe's number
D - decrement every number
s - square current timeline's current universe's number
S - square every number
r - square root current timeline's current universe's number
R - square root every number
y - round current timeline's current universe's number
Y - round every number
c - create timeline
> - go to the next timeline
< - go to the previous timeline
[ - go to the next universe
] - go to the previous universe
0 - donut
o - output current timeline's current universe's number
O - output every number
u - output current timeline's current universe's ASCII
U - output every ASCII

Hello world

iiisdsiiiiiiiiuiiiiiiiiiiiiiiiiiiiiiiiiiiiiiuiiiiiiiuuiiiu
ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddduddddddddddddu
dddddddddddddddddddddsddudddddddduiiiudddddduddddddddu
dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddu