Kerala had yesterday taken a 122-run first essay lead by declaring their innings at 301 for nine in reply to Tripura's 179 all out.
Resuming on 84 for two in their second innings, Tripura were trailing Kerala by 38 runs, but by the end of the day, the home side reached 295 for nine to deter the visitors from posting a win.
Opener Bishal Ghosh, who started the day on 47, scored 266-ball 82 with the help of 10 fours to be the top-scorer for Tripura.
For Kerala, Amit Verma (5/61) was the pick of the bowlers.
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Brief scores:
Tripura: 179 & 295 for 9 in 124.2 overs (Bishal Ghosh 82, N N Sen Chowdhary 72; Amit Verma 5/61).
Kerala: 301 for 9 decl.
Points: Kerala 3, Tripura 1.