This is a good route
I-90/I-39 -> I-39 -> US-24 -> I-65 -> I-70
But I like this one better.
You select your route to I 80, East to Indiana 49 (only minor toll charges)
49 to Rt. 30. SE on Rt. 30 to Rt. 33
Rt 33 to Columbus. You have 85% 4 lane roads. Warsaw, Indiana is the only area that is congested. About 7 traffic lights. You also can take Rt 30 to I 75, South to Rt. 117, to Rt. 33. This is also good road. 117 is single lane, but mostly rural driving and no major traffic issues. I 75 to Rt. 33 has MAJOR construction just South of Lima. Avoid if possible.