A newly expanded Big Ten Conference has presented the same old challenges for longtime coaches such as Fran McCaffery of Iowa.”I’d say in many ways it’s as tough as it’s ever been,” McCaffery said. “Whether we have 12 teams, 14 teams, 16, 18 — they’re all really good teams. It’s not like you can ever look at anybody and say, ‘That’s an easy win’. Because it’s not.”Every team has really good players, and every team has a really good coach.”The grueling test will continue for Iowa (13-8, 4-6) as it tips off against No. 10 Purdue (17-5, 9-2) on Tuesday evening in Iowa City, Iowa.Winners of nine of their last 10 games, the Boilermakers will look to stay hot after holding off Indiana 81-76 on Friday night. Purdue will hit the road for the first time since Jan. 18, when it knocked off then-No. 13 Oregon.Purdue is led by Trey Kaufman-Renn, who is averaging 18.4 points and 6.2 rebounds in 22 games. He is shooting 60.4 percent from the field and 42.9 percent from 3-point range.Braden Smith is second on the team with 15.8 points per game to go with a team-high 8.8 assists. He will try to stay hot after scoring 24 points in back-to-back games.Fletcher Loyer rounds out the Boilermakers’ big three on offense. He is averaging 14 points per game and is shooting 46.3 percent from beyond the arc.Boilermakers coach Matt Painter said other players have stepped forward in recent games, as well. That group includes Gicarri Harris, a freshman guard who scored nine points in 22 minutes against Indiana.